@article{PhysRevResearch.7.023168,

title = {Electronic structure of Mn_{(1-x)}Pb_{x}Bi_{2}Te_{4}: Experimental evidence of topological phase transition},

author = {D. A. Estyunin and T. P. Estyunina and I. I. Klimovskikh and K. A. Bokai and V. A. Golyashov and K. A. Kokh and O. E. Tereshchenko and S. Ideta and Y. Miyai and Y. Kumar and T. Iwata and T. Kosa and T. Okuda and K. Miyamoto and K. Kuroda and K. Shimada and A. M. Shikin},

url = {https://link.aps.org/doi/10.1103/PhysRevResearch.7.023168},

doi = {10.1103/PhysRevResearch.7.023168},

year  = {2025},

date = {2025-05-01},

urldate = {2025-05-01},

journal = {Phys. Rev. Res.},

volume = {7},

issue = {2},

pages = {023168},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevResearch.7.L022005,

title = {Spin splitting in the surface electronic structure of antiferromagnet NdBi},

author = {Rikako Yamamoto and Takeru Motoyama and Takuma Iwata and Towa Kosa and Yukimi Nishioka and Kazumasa Ideura and Masashi Arita and Koji Miyamoto and Taichi Okuda and Akio Kimura and Takemi Yamada and Yuki Yanagi and Takahiro Onimaru and Kenta Kuroda},

url = {https://link.aps.org/doi/10.1103/PhysRevResearch.7.L022005},

doi = {10.1103/PhysRevResearch.7.L022005},

year  = {2025},

date = {2025-04-01},

journal = {Phys. Rev. Res.},

volume = {7},

pages = {L022005},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.111.115158,

title = {Spin texture tunability in Mn_{1-x}Ge_{x}Bi_{2}Te_{4} through varying Ge concentration},

author = {A. M. Shikin and D. A. Estyunin and N. L. Zaitsev and T. P. Estyunina and A. V. Eryzhenkov and A. G. Rybkin and K. A. Kokh and O. E. Tereshchenko and T. Iwata and K. Kuroda and K. Miyamoto and T. Okuda and K. Shimada and A. V. Tarasov},

url = {https://link.aps.org/doi/10.1103/PhysRevB.111.115158},

doi = {10.1103/PhysRevB.111.115158},

year  = {2025},

date = {2025-03-01},

urldate = {2025-03-01},

journal = {Phys. Rev. B},

volume = {111},

pages = {115158},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.111.L081116,

title = {Zone-selection effect of photoelectron intensity distributions in the nonsymmorphic system RAlSi (R=Ce or Nd)},

author = {Yusei Morita and K. Nakanishi and T. Iwata and K. Ohwada and Y. Nishioka and T. Kousa and M. Nurmamat and K. Yamagami and A. Kimura and T. Yamada and H. Tanida and Kenta Kuroda},

url = {https://link.aps.org/doi/10.1103/PhysRevB.111.L081116},

doi = {10.1103/PhysRevB.111.L081116},

year  = {2025},

date = {2025-02-01},

urldate = {2025-02-01},

journal = {Phys. Rev. B},

volume = {111},

pages = {L081116},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Shikin2025,

title = {Phase transitions, Dirac and Weyl semimetal states in Mn1−xGexBi2Te4},

author = {A. M. Shikin and N. L. Zaitsev and T. P. Estyunina and D. A. Estyunin and A. G. Rybkin and D. A. Glazkova and I. I. Klimovskikh and A. V. Eryzhenkov and K. A. Kokh and V. A. Golyashov and O. E. Tereshchenko and S. Ideta and Y. Miyai and Y. Kumar and T. Iwata and T. Kosa and K. Kuroda and K. Shimada and A. V. Tarasov},

url = {https://doi.org/10.1038/s41598-024-73267-1},

doi = {10.1038/s41598-024-73267-1},

issn = {2045-2322},

year  = {2025},

date = {2025-01-11},

journal = {Scientific Reports},

volume = {15},

number = {1},

pages = {1741},

abstract = {Using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), an experimental and theoretical study of changes in the electronic structure (dispersion dependencies) and corresponding modification of the energy band gap at the Dirac point (DP) for topological insulator (TI) $$backslashtextrmMn_1-x backslashtextrmGe_x backslashtextrmBi_2 backslashtextrmTe_4$$have been carried out with gradual replacement of magnetic Mn atoms by non-magnetic Ge atoms when concentration of the latter was varied from 10% to 75%. It was shown that when Ge concentration increases, the bulk band gap decreases and reaches zero plateau in the concentration range of 45–60% while trivial surface states (TrSS) are present and exhibit an energy splitting of 100 and 70 meV in different types of measurements. It was also shown that TSS disappear from the measured band dispersions at a Ge concentration of about 40%. DFT calculations of $$backslashtextrmMn_1-x backslashtextrmGe_x backslashtextrmBi_2 backslashtextrmTe_4$$band structure were carried out to identify the nature of observed band dispersion features and to analyze the possibility of magnetic Weyl semimetal state formation in this system. These calculations were performed for both antiferromagnetic (AFM) and ferromagnetic (FM) ordering types while the spin-orbit coupling (SOC) strength was varied or a strain (compression or tension) along the c-axis was applied. Calculations show that two different series of topological phase transitions (TPTs) may be implemented in this system, depending on the magnetic ordering. In the case of AFM ordering, the transition between TI and the trivial insulator phase passes through the Dirac semimetal state, whereas for FM phase such route admits three intermediate states instead of one (TI—Dirac semimetal—Weyl semimetal—Dirac semimetal—trivial insulator). Weyl points that form in the FM system along the $$backslashvarGamma backslash!Z$$direction annihilate when either the SOC strength decreases or a sufficient tensile strain is applied, which is accompanied by the corresponding TPTs. Model calculations of the influence of local magnetic ordering in AFM $$backslashtextrmMn_1-x backslashtextrmGe_x backslashtextrmBi_2 backslashtextrmTe_4$$were carried out by alternating Mn layers with Ge-doped layers and showed that the magnetic Weyl semimetal state in this system is reachable at a Ge concentration of approximately 40% without application of any external magnetic fields.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{HIGUCHI2025113944,

title = {Determination of the actual valence band of a topological insulator Bi_{2}Se_{3}},

author = {Yuki Higuchi and Ryota Itaya and Harutaka Saito and Yuichiro Toichi and Takahiro Kobayashi and Mito Tomita and Shigemi Terakawa and Katsuhiro Suzuki and Kenta Kuroda and Takao Kotani and Fumihiko Matsui and Shigemasa Suga and Hitoshi Sato and Kazunori Sato and Kazuyuki Sakamoto},

url = {https://www.sciencedirect.com/science/article/pii/S0042207X24009904},

doi = {https://doi.org/10.1016/j.vacuum.2024.113944},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Vacuum},

volume = {233},

pages = {113944},

abstract = {A proper understanding of the electronic structure of topological insulators in terms of bulk states as well as surface spin polarized states is essential for the development of spintronic devices. In this work, we investigated the electronic structure of Bi2Se3, a typical n-type topological insulator. Experimentally, we measured the band dispersions along Γ̄-M̄ and the constant energy contours in the entire three-dimensional Brillouin zone, and confirmed that the valence band maximum is located at the Γ point with a binding energy 65±15 meV higher than that of the Dirac point. The theoretical calculations performed by a quasi-particle self-consistent GW method show good agreement with the experimental results on the bulk band structure. The present results indicate that Bi2Se3 is a suitable candidate for next-generation spintronic devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sumida2025,

title = {Surface-specific thermal spin-depolarization on the half-metallic Heusler films},

author = {Kazuki Sumida and Masaaki Kakoki and Yuya Sakuraba and Keisuke Masuda and Kazuki Goto and Takashi Kono and Koji Miyamoto and Yoshio Miura and Kazuhiro Hono and Taichi Okuda and Akio Kimura},

url = {https://doi.org/10.1038/s42005-024-01918-w},

doi = {10.1038/s42005-024-01918-w},

year  = {2025},

date = {2025-01-01},

journal = {Communications Physics},

volume = {8},

pages = {12},

abstract = {Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co2MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (TC). Magnetic junction devices using Co2MnSi show remarkable performance at low temperatures. However, the performance is significantly degraded at room temperature, which requires a detailed understanding of the temperature-dependent electronic structure of Co2MnSi films. Here, using surface-sensitive spin- and angle-resolved photoelectron spectroscopy combined with first-principles calculations, we verify the temperature- and momentum-dependent spin-polarization of Co2MnSi thin-film. The recorded spin-polarization reaches textasciitilde 60-75% at 50 K, while it reduces textasciitilde 30-50% at 300 K. The observed surface-specific spin-depolarization behavior can be described by the thermally excited magnon model even well below TC, and we conclude that the spin-fluctuation is markedly enhanced on its surface. Our findings provide insights into the temperature-dependent electronic structure of half-metallic Heusler films, which could have significant implications for future spintronic applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.9.014202,

title = {Emergence of high-mobility carriers in topological kagome bad metal Mn_{3}Sn by intense photoexcitation},

author = {Takuya Matsuda and Tomoya Higo and Kenta Kuroda and Takashi Koretsune and Natsuki Kanda and Yoshua Hirai and Hanyi Peng and Takumi Matsuo and Cedric Bareille and Andrei Varykhalov and Naotaka Yoshikawa and Jun Yoshinobu and Takeshi Kondo and Ryo Shimano and Satoru Nakatsuji and Ryusuke Matsunaga},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.9.014202},

doi = {10.1103/PhysRevMaterials.9.014202},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Phys. Rev. Mater.},

volume = {9},

pages = {014202},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.8.104004,

title = {Uncovering hidden Fermi surface instabilities through visualizing unconventional quasiparticle interference in CeTe_{3}},

author = {B. R. M. Smith and Y. Fujisawa and P. Wu and T. Nakamura and N. Tomoda and S. Kuniyoshi and D. Ueta and R. Kobayashi and R. Okuma and K. Arai and K. Kuroda and C. -H. Hsu and G. Chang and C. -Y. Huang and H. Lin and Z. Y. Wang and T. Kondo and Y. Okada},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.8.104004},

doi = {10.1103/PhysRevMaterials.8.104004},

year  = {2024},

date = {2024-10-01},

urldate = {2024-10-01},

journal = {Phys. Rev. Mater.},

volume = {8},

pages = {104004},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Iwasawa2024,

title = {Efficiency improvement of spin-resolved ARPES experiments using Gaussian process regression},

author = {Hideaki Iwasawa and Tetsuro Ueno and Takuma Iwata and Kenta Kuroda and Konstantin A. Kokh and Oleg E. Tereshchenko and Koji Miyamoto and Akio Kimura and Taichi Okuda},

url = {https://doi.org/10.1038/s41598-024-66704-8},

doi = {10.1038/s41598-024-66704-8},

year  = {2024},

date = {2024-09-23},

journal = {Scientific Reports},

volume = {14},

pages = {20970},

abstract = {The experimental efficiency has been a central concern for time-consuming experiments. Spin- and angle-resolved photoemission spectroscopy (spin-resolved ARPES) is renowned for its inefficiency in spin-detection, despite its outstanding capability to directly determine the spin-polarized electronic properties of materials. Here, we investigate the potential enhancement of the efficiency of spin-resolved ARPES experiments through the integration of measurement informatics. We focus on a representative topological insulator $$backslashtext Bi_2$$$$backslashtext Te_3$$, which has well-understood spin-polarized electronic states. We employ Gaussian process regression (GPR) to assess the accumulation of spin polarization information using an indicator known as the GPR score. Our analyses based on the GPR model suggest that the GPR score can serve as a stopping criterion for spin-resolved ARPES experiments. This criterion enables us to conduct efficient spin-resolved ARPES experiments, significantly reducing the time costs by 5-10 times, compared to empirical stopping criteria.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.133.086602,

title = {Robust Weak Topological Insulator in the Bismuth Halide Bi_{4}Br_{2}I_{2}},

author = {Ryo Noguchi and Masaru Kobayashi and Kaishu Kawaguchi and Wataru Yamamori and Kohei Aido and Chun Lin and Hiroaki Tanaka and Kenta Kuroda and Ayumi Harasawa and Viktor Kandyba and Mattia Cattelan and Alexei Barinov and Makoto Hashimoto and Donghui Lu and Masayuki Ochi and Takao Sasagawa and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.133.086602},

doi = {10.1103/PhysRevLett.133.086602},

year  = {2024},

date = {2024-08-01},

urldate = {2024-08-01},

journal = {Phys. Rev. Lett.},

volume = {133},

pages = {086602},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.110.L041401,

title = {Spin-polarized saddle points in the topological surface states of elemental bismuth revealed by pump-probe spin- and angle-resolved photoemission spectroscopy},

author = {Yuto Fukushima and Kaishu Kawaguchi and Kenta Kuroda and Masayuki Ochi and Motoaki Hirayama and Ryo Mori and Hiroaki Tanaka and Ayumi Harasawa and Takushi Iimori and Zhigang Zhao and Shuntaro Tani and Koichiro Yaji and Shik Shin and Fumio Komori and Yohei Kobayashi and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.110.L041401},

doi = {10.1103/PhysRevB.110.L041401},

year  = {2024},

date = {2024-07-01},

journal = {Phys. Rev. B},

volume = {110},

pages = {L041401},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.133.016401,

title = {Fermi Surface Nesting Driving the RKKY Interaction in the Centrosymmetric Skyrmion Magnet Gd_{2}PdSi_{3}},

author = {Yuyang Dong and Yosuke Arai and Kenta Kuroda and Masayuki Ochi and Natsumi Tanaka and Yuxuan Wan and Matthew D. Watson and Timur K. Kim and Cephise Cacho and Makoto Hashimoto and Donghui Lu and Yuji Aoki and Tatsuma D. Matsuda and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.133.016401},

doi = {10.1103/PhysRevLett.133.016401},

year  = {2024},

date = {2024-07-01},

urldate = {2024-07-01},

journal = {Phys. Rev. Lett.},

volume = {133},

pages = {016401},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.109.L241114,

title = {Photoemission angular distribution beyond the single wavevector description of photoelectron final states},

author = {Hiroaki Tanaka and Shota Okazaki and Yuto Fukushima and Kaishu Kawaguchi and Ayumi Harasawa and Takushi Iimori and Fumio Komori and Masashi Arita and Ryo Mori and Kenta Kuroda and Takao Sasagawa and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.109.L241114 abst =We develop a simulation procedure for angle-resolved photoemission spectroscopy (ARPES), where a photoelectron wave function is set to be an outgoing plane wave in a vacuum associated with the emitted photoelectron wave packet. ARPES measurements on the transition metal dichalcogenide 1⁢𝑇−Ti⁢S2 are performed, and our simulations exhibit good agreement with experiments. Analysis of our calculated final state wave functions quantitatively visualizes that they include various waves due to the boundary condition and the uneven crystal potential. These results show that a more detailed investigation of the photoelectron final states is necessary to fully explain the photon-energy- and light-polarization-dependent ARPES spectra.},

doi = {10.1103/PhysRevB.109.L241114},

year  = {2024},

date = {2024-06-01},

journal = {Phys. Rev. B},

volume = {109},

pages = {L241114},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.132.136402,

title = {Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of \textit{AB}-Stacked Crystals},

author = {Hiroaki Tanaka and Shota Okazaki and Masaru Kobayashi and Yuto Fukushima and Yosuke Arai and Takushi Iimori and Mikk Lippmaa and Kohei Yamagami and Yoshinori Kotani and Fumio Komori and Kenta Kuroda and Takao Sasagawa and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.132.136402},

doi = {10.1103/PhysRevLett.132.136402},

year  = {2024},

date = {2024-03-01},

urldate = {2024-03-01},

journal = {Phys. Rev. Lett.},

volume = {132},

pages = {136402},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Itaya2024,

title = {Substrate-Dependent Physical Properties at the Interface of Manganese(II) Phthalocyanine and Topological Insulators},

author = {Ryota Itaya and Yuki Higuchi and Tomoki Nishioka and Mito Tomita and Kenta Kuroda and Jun Fujii and Hitoshi Sato and Kazuyuki Sakamoto},

url = {https://doi.org/10.1021/acs.jpcc.3c07955},

doi = {10.1021/acs.jpcc.3c07955},

year  = {2024},

date = {2024-02-15},

journal = {The Journal of Physical Chemistry C},

volume = {128},

pages = {2705-2712},

publisher = {American Chemical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Iwata2024,

title = {Laser-based angle-resolved photoemission spectroscopy with micrometer spatial resolution and detection of three-dimensional spin vector},

author = {Takuma Iwata and T. Kousa and Y. Nishioka and K. Ohwada and K. Sumida and E. Annese and M. Kakoki and Kenta Kuroda and H. Iwasawa and M. Arita and S. Kumar and A. Kimura and K. Miyamoto and T. Okuda},

url = {https://doi.org/10.1038/s41598-023-47719-z},

doi = {10.1038/s41598-023-47719-z},

year  = {2024},

date = {2024-01-04},

urldate = {2024-01-04},

journal = {Scientific Reports},

volume = {14},

pages = {127},

abstract = {We have developed a state-of-the-art apparatus for laser-based spin- and angle-resolved photoemission spectroscopy with micrometer spatial resolution (textmu-SARPES). This equipment is realized by the combination of a high-resolution photoelectron spectrometer, a 6 eV laser with high photon flux that is focused down to a few micrometers, a high-precision sample stage control system, and a double very-low-energy-electron-diffraction spin detector. The setup achieves an energy resolution of 1.5 (5.5) meV without (with) the spin detection mode, compatible with a spatial resolution better than 10 textmum. This enables us to probe both spatially-resolved electronic structures and vector information of spin polarization in three dimensions. The performance of textmu-SARPES apparatus is demonstrated by presenting ARPES and SARPES results from topological insulators and Au photolithography patterns on a Si (001) substrate.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{D3NR03830K,

title = {Emergence of quasi-1D spin-polarized states in ultrathin Bi films on InAs(111)A for spintronics applications},

author = {Alexey N. Mihalyuk and Leonid V. Bondarenko and Alexandra Y. Tupchaya and Dimitry V. Gruznev and Nadezhda Yu. Solovova and Vladimir A. Golyashov and Oleg E. Tereshchenko and Taichi Okuda and Akio Kimura and Sergey V. Eremeev and Andrey V. Zotov and Alexander A. Saranin},

url = {http://dx.doi.org/10.1039/D3NR03830K},

doi = {10.1039/D3NR03830K},

year  = {2024},

date = {2024-01-01},

journal = {Nanoscale},

volume = {16},

pages = {1272-1281},

publisher = {The Royal Society of Chemistry},

abstract = {The discovery, characterization, and control of heavy-fermion low-dimensional materials are central to nanoscience since quantum phenomena acquire an exotic and highly tunable character. In this work, through a variety of comprehensive experimental and theoretical techniques, it was observed and predicted that the synthesis of ultrathin Bi films on the InAs(111)A surface produces quasi-one-dimensional spin-polarized states, providing a platform for the realization of a unique spin-transport regime in the system. Scanning tunneling microscopy and low-energy electron diffraction measurements revealed that the InAs(111)A substrate facilitates the formation of the Bi-dimer phase of 2√3 × 3 periodicity with an admixture of the Bi-bilayer phase under submonolayer Bi deposition. X-ray photoelectron spectroscopy (XPS) measurements have shown the chemical stability of the Bi-induced phases, while spin and angle resolved photoemission spectroscopy (SARPES) observations combined with state-of-the-art DFT calculations have revealed that the electronic spectrum of the Bi-dimer phase holds a quasi-1D hole-like spin-split state at the Fermi level with advanced spin texture, whereas the Bi-bilayer phase demonstrates metallic states with large Rashba spin-splitting. The band structure of the Bi/InAs(111)A interface is discovered to hold great potential as a high-performance spintronics material fabricated in the ultimate two-dimensional limit.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{10.1093/jmicro/dfae021,

title = {Spin polarization of photoelectrons emitted from spin-orbit coupled surface states of Pb/Ge(111)},

author = {Koichiro Yaji and Kenta Kuroda and Shunsuke Tsuda and Fumio Komori},

url = {https://doi.org/10.1093/jmicro/dfae021},

doi = {10.1093/jmicro/dfae021},

year  = {2024},

date = {2024-01-01},

journal = {Microscopy},

pages = {dfae021},

abstract = {We report that the spin vector of photoelectrons emitted from an atomic layer Pb grown on a germanium substrate [Pb/Ge(111)] can be controlled using an electric field of light. The spin polarization of photoelectrons excited by a linearly polarized light is precisely investigated by spin- and angle-resolved photoemission spectroscopy. The spin polarization of the photoelectrons observed in the mirror plane reverses between p- and s-polarized lights. Considering the dipole transition selection rule, the surface state of Pb/Ge(111) is represented by a linear combination of symmetric and asymmetric orbital components coupled with spins in mutually opposite directions. The spin direction of the photoelectrons is different from that of the initial state when the electric field vector of linearly polarized light deviates from p- or s-polarization conditions. The quantum interference in the photoexcitation process can determine the direction of the spin vector of photoelectrons.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.110.224436,

title = {GdAlSi: An antiferromagnetic topological Weyl semimetal with nonrelativistic spin splitting},

author = {Jadupati Nag and Bishal Das and Sayantika Bhowal and Yukimi Nishioka and Barnabha Bandyopadhyay and Saugata Sarker and Shiv Kumar and Kenta Kuroda and Venkatraman Gopalan and Akio Kimura and K. G. Suresh and Aftab Alam},

url = {https://link.aps.org/doi/10.1103/PhysRevB.110.224436},

doi = {10.1103/PhysRevB.110.224436},

year  = {2024},

date = {2024-01-01},

journal = {Phys. Rev. B},

volume = {110},

pages = {224436},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.108.L241101,

title = {Role of on-site Coulomb interactions in the half-metallic Weyl ferromagnet candidate thin-film Co_{2}FeSi},

author = {Kazuki Sumida and Yuichi Fujita and Weinan Zhou and Keisuke Masuda and Ikuto Kawasaki and Shin-ichi Fujimori and Akio Kimura and Yuya Sakuraba},

url = {https://link.aps.org/doi/10.1103/PhysRevB.108.L241101},

doi = {10.1103/PhysRevB.108.L241101},

year  = {2023},

date = {2023-12-01},

urldate = {2023-12-01},

journal = {Phys. Rev. B},

volume = {108},

pages = {L241101},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.7.114201,

title = {Creation of a \textit{p}-type TlBiSe_{2} using photo-induced doping},

author = {Ryota Itaya and Yuichiro Toichi and Ryuya Nakanishi and Narunori Ebara and Yoshitaka Nakata and Kentaro Kasai and Kenta Kuroda and Masashi Arita and Isamu Yamamoto and Keisuke Fukutani and Kazuyuki Sakamoto},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.7.114201},

doi = {10.1103/PhysRevMaterials.7.114201},

year  = {2023},

date = {2023-11-01},

urldate = {2023-11-01},

journal = {Phys. Rev. Mater.},

volume = {7},

issue = {11},

pages = {114201},

publisher = {American Physical Society},

abstract = {Owing to the location of the Dirac point, which is around the center of its wide bulk band gap, TlBiSe2 would be one of the most promising topological insulators for spintronics devices material. However, like many other topological insulators, defects, such as vacancy formed during the crystal growth, dope electrons into TlBiSe2 and make its bulk metallic. Here, we show the achievement of bulk insulating both n-type and p-type TlBiSe2 by photo-induced doping, a method carried out by a combination of photo-irradiation and H2O adsorption. We also show that the main trigger of this photo-induced doping is the excitation of the outermost d core level of the chalcogen atoms of the topmost layer as in the case of Bi2X3, where X=Se or Te.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.107.235306,

title = {Boosting the surface conduction in a topological insulator},

author = {M. Taupin and G. Eguchi and M. Luifmmode checkzelse žfinik and A. Steiger-Thirsfeld and Y. Ishida and K. Kuroda and S. Shin and A. Kimura and S. Paschen},

url = {https://link.aps.org/doi/10.1103/PhysRevB.107.235306},

doi = {10.1103/PhysRevB.107.235306},

year  = {2023},

date = {2023-06-01},

journal = {Phys. Rev. B},

volume = {107},

issue = {23},

pages = {235306},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.130.186402,

title = {Semiconducting Electronic Structure of the Ferromagnetic Spinel HgCr_{2}Se_{4} Revealed by Soft-X-Ray Angle-Resolved Photoemission Spectroscopy},

author = {Hiroaki Tanaka and Andrei V. Telegin and Yurii P. Sukhorukov and Vladimir A. Golyashov and Oleg E. Tereshchenko and Alexander N. Lavrov and Takuya Matsuda and Ryusuke Matsunaga and Ryosuke Akashi and Mikk Lippmaa and Yosuke Arai and Shinichiro Ideta and Kiyohisa Tanaka and Takeshi Kondo and Kenta Kuroda},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.130.186402},

doi = {10.1103/PhysRevLett.130.186402},

year  = {2023},

date = {2023-05-01},

urldate = {2023-05-01},

journal = {Phys. Rev. Lett.},

volume = {130},

issue = {18},

pages = {186402},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{TANAKA2023147297,

title = {SPADExp: A photoemission angular distribution simulator directly linked to first-principles calculations},

author = {Hiroaki Tanaka and Kenta Kuroda and Tomohiro Matsushita},

url = {https://www.sciencedirect.com/science/article/pii/S0368204823000142},

doi = {https://doi.org/10.1016/j.elspec.2023.147297},

issn = {0368-2048},

year  = {2023},

date = {2023-01-01},

journal = {Journal of Electron Spectroscopy and Related Phenomena},

volume = {264},

pages = {147297},

abstract = {We develop a software package SPADExp (simulator of photoemission angular distribution for experiments) to calculate the photoemission angular distribution (PAD), which is the momentum dependence of spectrum intensity in angle-resolved photoemission spectroscopy (ARPES). The software can directly load the output of the first-principles software package OpenMX, so users do not need to construct tight-binding models as previous studies did for PAD calculations. As a result, we can calculate the PADs of large systems such as quasicrystals and slab systems. We calculate the PADs of sublattice systems (graphene and graphite) to reproduce characteristic intensity distributions, which ARPES has experimentally observed. After that, we investigate twisted bilayer graphene, a quasicrystal showing 12-fold rotational symmetric spectra in ARPES, and the surface states of the topological insulator Bi2Se3. Our calculations show good agreement with previous ARPES measurements, showing the correctness of our calculation software and further potential to investigate the photoemission spectra of novel quantum materials.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Reimann2023,

title = {Ultrafast electron dynamics in a topological surface state observed in two-dimensional momentum space},

author = {J. Reimann and K. Sumida and M. Kakoki and K. A. Kokh and O. E. Tereshchenko and A. Kimura and J. Güdde and U. Höfer},

url = {https://doi.org/10.1038/s41598-023-32811-1},

doi = {10.1038/s41598-023-32811-1},

year  = {2023},

date = {2023-01-01},

journal = {Scientific Reports},

volume = {13},

pages = {5796},

abstract = {We study ultrafast population dynamics in the topological surface state of Sb$$_2$$Te$$_3$$in two-dimensional momentum space with time- and angle-resolved two-photon photoemission spectroscopy. Linearly polarized mid-infrared pump pulses are used to permit a direct optical excitation across the Dirac point. We show that this resonant excitation is strongly enhanced within the Dirac cone along three of the six $$backslashbarbackslashGamma $$--$$backslashbarM$$directions and results in a macroscopic photocurrent when the plane of incidence is aligned along a $$backslashbarbackslashGamma $$--$$backslashbarK$$direction. Our experimental approach makes it possible to disentangle the decay of transiently excited population and photocurent by elastic and inelastic electron scattering within the full Dirac cone in unprecedented detail. This is utilized to show that doping of Sb$$_2$$Te$$_3$$by vanadium atoms strongly enhances inelastic electron scattering to lower energies, but only scarcely affects elastic scattering around the Dirac cone.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{fukushima2023spin,

title = {Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES},

author = {Yuto Fukushima and Kaishu Kawaguchi and Kenta Kuroda and Masayuki Ochi and Hiroaki Tanaka and Ayumi Harasawa and Takushi Iimori and Zhigang Zhao and Shuntaro Tani and Koichiro Yaji and others},

url = {https://arxiv.org/abs/2303.17816},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {arXiv preprint arXiv:2303.17816},

abstract = {We use a pump-probe, spin-, and angle-resolved photoemission spectroscopy (ARPES) with a 10.7 eV laser accessible up to the Brillouin zone edge, and reveal for the first time the entire band structure, including the unoccupied side, for the elemental bismuth (Bi) with the spin-polarized surface states. Our data identify Bi as in a strong topological insulator phase (Z2=1) against the prediction of most band calculations. We unveil that the unoccupied topological surface states possess spin-polarized saddle points yielding the van Hove singularity, providing an excellent platform for the future development of opto-spintronics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.107.L241101,

title = {Evidence for three-dimensional Dirac conical bands in TlBiSSe by optical and magneto-optical spectroscopy},

author = {F. Le Mardelé and J. Wyzula and I. Mohelsky and S. Nasrallah and M. Loh and S. Ben David and O. Toledano and D. Tolj and M. Novak and G. Eguchi and S. Paschen and N. Bariifmmode checkselse šfiiifmmode acutecelse ćfi and J. Chen and A. Kimura and M. Orlita and Z. Rukelj and Ana Akrap and D. Santos-Cottin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.107.L241101},

doi = {10.1103/PhysRevB.107.L241101},

year  = {2023},

date = {2023-01-01},

journal = {Phys. Rev. B},

volume = {107},

issue = {24},

pages = {L241101},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{10.1063/5.0151859,

title = {Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser},

author = {Kaishu Kawaguchi and Kenta Kuroda and Z. Zhao and S. Tani and A. Harasawa and Y. Fukushima and H. Tanaka and R. Noguchi and T. Iimori and K. Yaji and M. Fujisawa and S. Shin and F. Komori and Y. Kobayashi and Takeshi Kondo},

url = {https://doi.org/10.1063/5.0151859},

doi = {10.1063/5.0151859},

year  = {2023},

date = {2023-01-01},

journal = {Review of Scientific Instruments},

volume = {94},

number = {8},

pages = {083902},

abstract = {We describe a setup of time-, spin-, and angle-resolved photoemission spectroscopy (tr-SARPES) employing a 10.7 eV (λ = 115.6 nm) pulse laser at a 1 MHz repetition rate as a probe photon source. This equipment effectively combines the technologies of a high-power Yb:fiber laser, ultraviolet-driven harmonic generation in Xe gas, and a SARPES apparatus equipped with very-low-energy-electron-diffraction spin detectors. A high repetition rate (1 MHz) of the probe laser allows experiments with the photoemission space-charge effects significantly reduced, despite a high flux of 1013 photons/s on the sample. The relatively high photon energy (10.7 eV) also brings the capability of observing a wide momentum range that covers the entire Brillouin zone of many materials while ensuring high momentum resolution. The experimental setup overcomes the low efficiency of spin-resolved measurements, which gets even more severe for the pump-probed unoccupied states, and affords the opportunity to investigate ultrafast electron and spin dynamics of modern quantum materials with energy and time resolutions of 25 meV and 360 fs, respectively.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{tanaka2023broken,

title = {Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of AB-Stacked Crystals},

author = {Hiroaki Tanaka and Shota Okazaki and Masaru Kobayashi and Yuto Fukushima and Yosuke Arai and Takushi Iimori and Mikk Lippmaa and Kohei Yamagami and Yoshinori Kotani and Fumio Komori and Kenta Kuroda and Takao Sasagawa and Takeshi Kondo},

url = {https://arxiv.org/abs/2308.00999},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {arXiv preprint arXiv:2308.00999},

abstract = {We investigate the electronic structure of 2H-NbS2 and hBN by angle-resolved photoemission spectroscopy (ARPES) and photoemission intensity calculations. Although in bulk form, these materials are expected to exhibit band degeneracy in the kz=π/c plane due to screw rotation and time-reversal symmetries, we observe gapped band dispersion near the surface. We extract from first-principles calculations the near-surface electronic structure probed by ARPES and find that the calculated photoemission spectra from the near-surface region reproduce the gapped ARPES spectra. Our results show that the near-surface electronic structure can be qualitatively different from the bulk one due to partially broken nonsymmorphic symmetries.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{doi:10.7566/JPSJ.92.084706,

title = {One-Dimensional Band Structure in Quasi-Two-Dimensional η-Mo_{4}O_{11} Revealed by Angle-Resolved Photoelectron Spectroscopy and First-Principles Calculation},

author = {Kazuki Sumida and Sota Higaki and Hitoshi Sato and Daichi Tsuru and Koji Miyamoto and Taichi Okuda and Yoshihiro Kuroiwa and Chikako Moriyoshi and Kouichi Takase and Tamio Oguchi and Akio Kimura},

url = {https://doi.org/10.7566/JPSJ.92.084706},

doi = {10.7566/JPSJ.92.084706},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {Journal of the Physical Society of Japan},

volume = {92},

number = {8},

pages = {084706},

abstract = {We investigated the electronic structure of η-Mo4O11 bulk crystal in the whole Brillouin zone in its normal metallic phase by utilizing resonant and angle-resolved photoelectron spectroscopies and first-principles calculations. Mo 4p-4d resonant photoelectron experiment revealed that the Mo 4d electrons of MoO6 octahedra mainly contributed to the electrical conductivity. We also demonstrated that the free electron-like band dispersions along kb axis, consisting of Mo 4dxy electrons, do not show clear ka and kc dependences and formed a one-dimensional Fermi surface even in the normal phase. The observed low-dimensional and anisotropic band structures are expected to give rise to exotic physical properties such as quantized bulk Hall effect, charge density wave transitions, and Luttinger liquid behavior.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.129.146401,

title = {Coexistence of Strong and Weak Topological Orders in a Quasi-One-Dimensional Material},

author = {De-Yang Wang and Qi Jiang and Kenta Kuroda and Kaishu Kawaguchi and Ayumi Harasawa and Koichiro Yaji and Arthur Ernst and Hao-Ji Qian and Wen-Jing Liu and He-Ming Zha and Zhi-Cheng Jiang and Ni Ma and Hong-Ping Mei and Ang Li and Takeshi Kondo and Shan Qiao and Mao Ye},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.129.146401},

doi = {10.1103/PhysRevLett.129.146401},

year  = {2022},

date = {2022-09-01},

journal = {Phys. Rev. Lett.},

volume = {129},

pages = {146401},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.106.085114,

title = {Anomalously large spin-dependent electron correlation in the nearly half-metallic ferromagnet CoS_{2}},

author = {Hirokazu Fujiwara and Kensei Terashima and Junya Otsuki and Nayuta Takemori and Harald O. Jeschke and Takanori Wakita and Yuko Yano and Wataru Hosoda and Noriyuki Kataoka and Atsushi Teruya and Masashi Kakihana and Masato Hedo and Takao Nakama and Yoshichika Ōfinuki and Koichiro Yaji and Ayumi Harasawa and Kenta Kuroda and Shik Shin and Koji Horiba and Hiroshi Kumigashira and Yuji Muraoka and Takayoshi Yokoya},

url = {https://link.aps.org/doi/10.1103/PhysRevB.106.085114},

doi = {10.1103/PhysRevB.106.085114},

year  = {2022},

date = {2022-08-01},

urldate = {2022-08-01},

journal = {Phys. Rev. B},

volume = {106},

pages = {085114},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.6.074403,

title = {Rhombic Fermi surfaces in a ferromagnetic MnGa thin film with perpendicular magnetic anisotropy},

author = {M. Kobayashi and N. H. D. Khang and T. Takeda and K. Araki and R. Okano and M. Suzuki and K. Kuroda and K. Yaji and K. Sugawara and S. Souma and K. Nakayama and K. Yamauchi and M. Kitamura and K. Horiba and A. Fujimori and T. Sato and S. Shin and M. Tanaka and P. N. Hai},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.6.074403},

doi = {10.1103/PhysRevMaterials.6.074403},

year  = {2022},

date = {2022-07-01},

journal = {Phys. Rev. Materials},

volume = {6},

pages = {074403},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.105.L241115,

title = {Nodal-line driven anomalous susceptibility in ZrSiS},

author = {Bruno Gudac and Markus Kriener and Yuriy V. Sharlai and Mihovil Bosnar and Filip Orbaniıfmmode acutecelse ćfi and Grigorii P. Mikitik and Akio Kimura and Ivan Kokanoviıfmmode acutecelse ćfi and Mario Novak},

url = {https://link.aps.org/doi/10.1103/PhysRevB.105.L241115},

doi = {10.1103/PhysRevB.105.L241115},

year  = {2022},

date = {2022-06-01},

journal = {Phys. Rev. B},

volume = {105},

pages = {L241115},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.6.044405,

title = {Magnetoelastic anisotropy in Heusler-type Mn_{(2-d)}CoGa_{(1+d)} films},

author = {Takahide Kubota and Daichi Takano and Yohei Kota and Shaktiranjan Mohanty and Keita Ito and Mitsuhiro Matsuki and Masahiro Hayashida and Mingling Sun and Yukiharu Takeda and Yuji Saitoh and Subhankar Bedanta and Akio Kimura and Koki Takanashi},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.6.044405},

doi = {10.1103/PhysRevMaterials.6.044405},

year  = {2022},

date = {2022-04-01},

urldate = {2022-04-01},

journal = {Phys. Rev. Mater.},

volume = {6},

pages = {044405},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.105.L121103,

title = {Evidence for Dirac nodal-line fermions in a phosphorous square-net superconductor},

author = {S. Ishizaka and A. Ino and T. Kono and Y. Miyai and S. Kumar and K. Shimada and H. Kit^o and I. Hase and S. Ishida and K. Oka and H. Fujihisa and Y. Gotoh and Y. Yoshida and A. Iyo and H. Ogino and H. Eisaki and K. Kawashima and Y. Yanagi and A. Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.105.L121103},

doi = {10.1103/PhysRevB.105.L121103},

year  = {2022},

date = {2022-03-01},

journal = {Phys. Rev. B},

volume = {105},

pages = {L121103},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.105.L121102,

title = {Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet CoNb_{3}S_{6}},

author = {Hiroaki Tanaka and Shota Okazaki and Kenta Kuroda and Ryo Noguchi and Yosuke Arai and Susumu Minami and Shinichiro Ideta and Kiyohisa Tanaka and Donghui Lu and Makoto Hashimoto and Viktor Kandyba and Mattia Cattelan and Alexei Barinov and Takayuki Muro and Takao Sasagawa and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.105.L121102},

doi = {10.1103/PhysRevB.105.L121102},

year  = {2022},

date = {2022-03-01},

urldate = {2022-03-01},

journal = {Phys. Rev. B},

volume = {105},

pages = {L121102},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.105.L121106,

title = {Visualization of optical polarization transfer to photoelectron spin vector emitted from a spin-orbit coupled surface state},

author = {Kenta Kuroda and Koichiro Yaji and Ryo Noguchi and Ayumi Harasawa and Shik Shin and Takeshi Kondo and Fumio Komori},

url = {https://link.aps.org/doi/10.1103/PhysRevB.105.L121106},

doi = {10.1103/PhysRevB.105.L121106},

year  = {2022},

date = {2022-03-01},

journal = {Phys. Rev. B},

volume = {105},

pages = {L121106},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Arai2022,

title = {Multipole polaron in the devil's staircase of CeSb},

author = {Y. Arai and Kenta Kuroda and T. Nomoto and Z. H. Tin and S. Sakuragi and C. Bareille and S. Akebi and K. Kurokawa and Y. Kinoshita and W. -L. Zhang and S. Shin and M. Tokunaga and H. Kitazawa and Y. Haga and H. S. Suzuki and S. Miyasaka and S. Tajima and K. Iwasa and R. Arita and Takeshi Kondo},

url = {https://doi.org/10.1038/s41563-021-01188-9},

doi = {10.1038/s41563-021-01188-9},

year  = {2022},

date = {2022-02-10},

urldate = {2022-02-10},

journal = {Nature Materials},

volume = {21},

pages = {410–415},

abstract = {Rare-earth intermetallic compounds exhibit rich phenomena induced by the interplay between localized f orbitals and conduction electrons. However, since the energy scale of the crystal-electric-field splitting is only a few millielectronvolts, the nature of the mobile electrons accompanied by collective crystal-electric-field excitations has not been unveiled. Here, we examine the low-energy electronic structures of CeSb through the anomalous magnetostructural transitions below the Néel temperature, textasciitilde17thinspaceK, termed the `devil's staircase', using laser angle-resolved photoemission, Raman and neutron scattering spectroscopies. We report another type of electron--boson coupling between mobile electrons and quadrupole crystal-electric-field excitations of the 4f orbitals, which renormalizes the Sb 5p band prominently, yielding a kink at a very low energy (textasciitilde7thinspacemeV). This coupling strength is strong and exhibits anomalous step-like enhancement during the devil's staircase transition, unveiling a new type of quasiparticle, named the `multipole polaron', comprising a mobile electron dressed with a cloud of the quadrupole crystal-electric-field polarization.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.105.085421,

title = {Selective observation of surface and bulk bands in polar WTe_{2} by laser-based spin- and angle-resolved photoemission spectroscopy},

author = {Yuxuan Wan and Lihai Wang and Kenta Kuroda and Peng Zhang and Keisuke Koshiishi and Masahiro Suzuki and Jaewook Kim and Ryo Noguchi and Cédric Bareille and Koichiro Yaji and Ayumi Harasawa and Shik Shin and Sang-Wook Cheong and Atsushi Fujimori and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.105.085421},

doi = {10.1103/PhysRevB.105.085421},

year  = {2022},

date = {2022-02-01},

urldate = {2022-02-01},

journal = {Phys. Rev. B},

volume = {105},

pages = {085421},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Shikin2021,

title = {Non-monotonic variation of the Kramers point band gap with increasing magnetic doping in BiTeI},

author = {A. M. Shikin and A. A. Rybkina and D. A. Estyunin and I. I. Klimovskikh and A. G. Rybkin and S. O. Filnov and A. V. Koroleva and E. V. Shevchenko and M. V. Likholetova and V. Yu. Voroshnin and A. E. Petukhov and K. A. Kokh and O. E. Tereshchenko and L. Petaccia and G. Di Santo and S. Kumar and A. Kimura and P. N. Skirdkov and K. A. Zvezdin and A. K. Zvezdin},

url = {https://doi.org/10.1038/s41598-021-02493-8},

doi = {10.1038/s41598-021-02493-8},

year  = {2021},

date = {2021-12-02},

journal = {Scientific Reports},

volume = {11},

pages = {23332},

abstract = {Polar Rashba-type semiconductor BiTeI doped with magnetic elements constitutes one of the most promising platforms for the future development of spintronics and quantum computing thanks to the combination of strong spin-orbit coupling and internal ferromagnetic ordering. The latter originates from magnetic impurities and is able to open an energy gap at the Kramers point (KP gap) of the Rashba bands. In the current work using angle-resolved photoemission spectroscopy (ARPES) we show that the KP gap depends non-monotonically on the doping level in case of V-doped BiTeI. We observe that the gap increases with V concentration until it reaches 3% and then starts to mitigate. Moreover, we find that the saturation magnetisation of samples under applied magnetic field studied by superconducting quantum interference device (SQUID) magnetometer has a similar behaviour with the doping level. Theoretical analysis shows that the non-monotonic behavior can be explained by the increase of antiferromagnetic coupled atoms of magnetic impurity above a certain doping level. This leads to the reduction of the total magnetic moment in the domains and thus to the mitigation of the KP gap as observed in the experiment. These findings provide further insight in the creation of internal magnetic ordering and consequent KP gap opening in magnetically-doped Rashba-type semiconductors.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.104.L180409,

title = {Scaling law for Rashba-type spin splitting in quantum-well films},

author = {Ryo Noguchi and Kenta Kuroda and Mitsuaki Kawamura and Koichiro Yaji and Ayumi Harasawa and Takushi Iimori and Shik Shin and Fumio Komori and Taisuke Ozaki and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.104.L180409},

doi = {10.1103/PhysRevB.104.L180409},

year  = {2021},

date = {2021-11-01},

urldate = {2021-11-01},

journal = {Phys. Rev. B},

volume = {104},

pages = {L180409},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.104.195112,

title = {Three-dimensional bulk Fermi surfaces and Weyl crossings of Co_{2}MnGa thin films underneath a protection layer},

author = {Takashi Kono and Masaaki Kakoki and Tomoki Yoshikawa and Xiaoxiao Wang and Kazuki Sumida and Takayuki Muro and Kazuki Goto and Yuya Sakuraba and Rie Y. Umetsu and Akio Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.104.195112},

doi = {10.1103/PhysRevB.104.195112},

year  = {2021},

date = {2021-11-01},

urldate = {2021-11-01},

journal = {Phys. Rev. B},

volume = {104},

pages = {195112},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.104.115168,

title = {Sample-dependent Dirac-point gap inMnBi_{2}Te_{4} and its response to applied surface charge: A combined photoemission and ab initio study},

author = {A. M. Shikin and D. A. Estyunin and N. L. Zaitsev and D. Glazkova and I. I. Klimovskikh and S. O. Filnov and A. G. Rybkin and E. F. Schwier and S. Kumar and A. Kimura and N. Mamedov and Z. Aliev and M. B. Babanly and K. Kokh and O. E. Tereshchenko and M. M. Otrokov and E. V. Chulkov and K. A. Zvezdin and A. K. Zvezdin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.104.115168},

doi = {10.1103/PhysRevB.104.115168},

year  = {2021},

date = {2021-09-01},

urldate = {2021-09-01},

journal = {Phys. Rev. B},

volume = {104},

pages = {115168},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lin2021,

title = {Visualization of the strain-induced topological phase transition in a quasi-one-dimensional superconductor TaSe_{3}},

author = {Chun Lin and Masayuki Ochi and Ryo Noguchi and Kenta Kuroda and Masahito Sakoda and Atsushi Nomura and Masakatsu Tsubota and Peng Zhang and Cedric Bareille and Kifu Kurokawa and Yosuke Arai and Kaishu Kawaguchi and Hiroaki Tanaka and Koichiro Yaji and Ayumi Harasawa and Makoto Hashimoto and Donghui Lu and Shik Shin and Ryotaro Arita and Satoshi Tanda and Takeshi Kondo},

url = {https://doi.org/10.1038/s41563-021-01004-4},

doi = {10.1038/s41563-021-01004-4},

year  = {2021},

date = {2021-08-01},

urldate = {2021-08-01},

journal = {Nature Materials},

volume = {20},

number = {8},

pages = {1093-1099},

abstract = {Control of the phase transition from topological to normal insulators can allow for an on/off switching of spin current. While topological phase transitions have been realized by elemental substitution in semiconducting alloys, such an approach requires preparation of materials with various compositions. Thus it is quite far from a feasible device application, which demands a reversible operation. Here we use angle-resolved photoemission spectroscopy and spin- and angle-resolved photoemission spectroscopy to visualize the strain-driven band-structure evolution of the quasi-one-dimensional superconductor TaSe3. We demonstrate that it undergoes reversible strain-induced topological phase transitions from a strong topological insulator phase with spin-polarized, quasi-one-dimensional topological surface states, to topologically trivial semimetal and band insulating phases. The quasi-one-dimensional superconductor TaSe3 provides a suitable platform for engineering the topological spintronics, for example as an on/off switch for a spin current that is robust against impurity scattering.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sakamoto2021,

title = {Spatial Control of Charge Doping in \textit{n}-Type Topological Insulators},

author = {Kazuyuki Sakamoto and Hirotaka Ishikawa and Takashi Wake and Chie Ishimoto and Jun Fujii and Hendrik Bentmann and Minoru Ohtaka and Kenta Kuroda and Natsu Inoue and Takuma Hattori and Toshio Miyamachi and Fumio Komori and Isamu Yamamoto and Cheng Fan and Peter Krüger and Hiroshi Ota and Fumihiko Matsui and Friedrich Reinert and José Avila and Maria C. Asensio},

url = {https://doi.org/10.1021/acs.nanolett.1c01100},

doi = {10.1021/acs.nanolett.1c01100},

year  = {2021},

date = {2021-05-26},

urldate = {2021-05-26},

journal = {Nano Letters},

volume = {21},

pages = {4415-4422},

publisher = {American Chemical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Noguchi2021,

title = {Evidence for a higher-order topological insulator in a three-dimensional material built from van der Waals stacking of bismuth-halide chains},

author = {Ryo Noguchi and Masaru Kobayashi and Zhanzhi Jiang and Kenta Kuroda and Takanari Takahashi and Zifan Xu and Daehun Lee and Motoaki Hirayama and Masayuki Ochi and Tetsuroh Shirasawa and Peng Zhang and Chun Lin and Cédric Bareille and Shunsuke Sakuragi and Hiroaki Tanaka and So Kunisada and Kifu Kurokawa and Koichiro Yaji and Ayumi Harasawa and Viktor Kandyba and Alessio Giampietri and Alexei Barinov and Timur K. Kim and Cephise Cacho and Makoto Hashimoto and Donghui Lu and Shik Shin and Ryotaro Arita and Keji Lai and Takao Sasagawa and Takeshi Kondo},

url = {https://doi.org/10.1038/s41563-020-00871-7},

doi = {10.1038/s41563-020-00871-7},

year  = {2021},

date = {2021-04-01},

journal = {Nature Materials},

volume = {20},

pages = {473-479},

abstract = {Low-dimensional van der Waals materials have been extensively studied as a platform with which to generate quantum effects. Advancing this research, topological quantum materials with van der Waals structures are currently receiving a great deal of attention. Here, we use the concept of designing topological materials by the van der Waals stacking of quantum spin Hall insulators. Most interestingly, we find that a slight shift of inversion centre in the unit cell caused by a modification of stacking induces a transition from a trivial insulator to a higher-order topological insulator. Based on this, we present angle-resolved photoemission spectroscopy results showing that the real three-dimensional material Bi4Br4 is a higher-order topological insulator. Our demonstration that various topological states can be selected by stacking chains differently, combined with the advantages of van der Waals materials, offers a playground for engineering topologically non-trivial edge states towards future spintronics applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.103.L060403,

title = {Itinerant ferromagnetism mediated by giant spin polarization of the metallic ligand band in the van der Waals magnet Fe_{5}GeTe_{2}},

author = {K. Yamagami and Y. Fujisawa and B. Driesen and C. H. Hsu and K. Kawaguchi and H. Tanaka and T. Kondo and Y. Zhang and H. Wadati and K. Araki and T. Takeda and Y. Takeda and T. Muro and F. C. Chuang and Y. Niimi and K. Kuroda and M. Kobayashi and Y. Okada},

url = {https://link.aps.org/doi/10.1103/PhysRevB.103.L060403},

doi = {10.1103/PhysRevB.103.L060403},

year  = {2021},

date = {2021-02-01},

urldate = {2021-02-01},

journal = {Phys. Rev. B},

volume = {103},

issue = {6},

pages = {L060403},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ye2021,

title = {Persistence of the Topological Surface States in Bi_{2}Se_{3} against Ag Intercalation at Room Temperature},

author = {Mao Ye and Kenta Kuroda and Mikhail M. Otrokov and Anastasia G. Ryabishchenkova and Qi Jiang and Arthur Ernst and Evgueni V. Chulkov and Masashi Nakatake and Masashi Arita and Taichi Okuda and Tomohiro Matsushita and László Tóth and Hiroshi Daimon and Kenya Shimada and Yoshifumi Ueda and Akio Kimura},

url = {https://doi.org/10.1021/acs.jpcc.0c07462},

doi = {10.1021/acs.jpcc.0c07462},

year  = {2021},

date = {2021-01-28},

urldate = {2021-01-28},

journal = {The Journal of Physical Chemistry C},

volume = {125},

pages = {1784-1792},

publisher = {American Chemical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhang2021,

title = {Observation and control of the weak topological insulator state in ZrTe_{5}},

author = {Peng Zhang and Ryo Noguchi and Kenta Kuroda and Chun Lin and Kaishu Kawaguchi and Koichiro Yaji and Ayumi Harasawa and Mikk Lippmaa and Simin Nie and Hongming Weng and V. Kandyba and A. Giampietri and A. Barinov and Qiang Li and G. D. Gu and Shik Shin and Takeshi Kondo},

url = {https://doi.org/10.1038/s41467-020-20564-8},

doi = {10.1038/s41467-020-20564-8},

year  = {2021},

date = {2021-01-18},

urldate = {2021-01-18},

journal = {Nature Communications},

volume = {12},

pages = {406},

abstract = {A quantum spin Hall (QSH) insulator hosts topological states at the one-dimensional (1D) edge, along which backscattering by nonmagnetic impurities is strictly prohibited. Its 3D analogue, a weak topological insulator (WTI), possesses similar quasi-1D topological states confined at side surfaces. The enhanced confinement could provide a route for dissipationless current and better advantages for applications relative to strong topological insulators (STIs). However, the topological side surface is usually not cleavable and is thus hard to observe. Here, we visualize the topological states of the WTI candidate ZrTe5 by spin and angle-resolved photoemission spectroscopy (ARPES): a quasi-1D band with spin-momentum locking was revealed on the side surface. We further demonstrate that the bulk band gap is controlled by external strain, realizing a more stable WTI state or an ideal Dirac semimetal (DS) state. The highly directional spin-current and the tunable band gap in ZrTe5 will provide an excellent platform for applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{SUMIDA2021100628b,

title = {Ultrafast surface Dirac fermion dynamics of Sb_{2}Te_{3}-based topological insulators},

author = {Kazuki Sumida and Yukiaki Ishida and Jens Güdde and Ulrich Höfer and Shik Shin and Akio Kimura},

url = {https://www.sciencedirect.com/science/article/pii/S0079681621000162},

doi = {https://doi.org/10.1016/j.progsurf.2021.100628},

year  = {2021},

date = {2021-01-01},

urldate = {2021-01-01},

journal = {Progress in Surface Science},

volume = {96},

pages = {100628},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{MIYASHITA2021114180,

title = {Emergence of low-energy electronic states in oxygen-controlled Mott insulator Ca_{2}RuO_{4+\textit{d}}},

author = {Takeo Miyashita and Hideaki Iwasawa and Tomoki Yoshikawa and Shusuke Ozawa and Hironoshin Oda and Takayuki Muro and Hiroki Ogura and Tatsuhiro Sakami and Fumihiko Nakamura and Akihiro Ino},

url = {https://www.sciencedirect.com/science/article/pii/S0038109820306724},

doi = {https://doi.org/10.1016/j.ssc.2020.114180},

issn = {0038-1098},

year  = {2021},

date = {2021-01-01},

urldate = {2021-01-01},

journal = {Solid State Communications},

volume = {326},

pages = {114180},

abstract = {Insulator-to-metal transition in Ca2RuO4 has drawn keen attention because of its sensitivity to various stimulation and its potential controllability. Here, we report a direct observation of Fermi surface, which emerges upon introducing excess oxygen into an insulating Ca2RuO4, by using angle-resolved photoemission spectroscopy. Comparison between energy distribution curves shows that the Mott insulating gap is closed by eV-scale spectral-weight transfer with excess oxygen. Momentum-space mapping exhibits two square-shaped sheets of the Fermi surface. One is a hole-like α sheet around the corner of a tetragonal Brillouin zone, and the other is an electron-like β sheet around the Γ point. The electron occupancies of the α and β bands are determined to be nα=1.6 and nβ=0.6, respectively. Our result indicates that the insulator-to-metal transition occurs selectively in dxz and dyz bands and not yet in dxy band. This orbital selectivity is most likely explained in terms of the energy level of dxy, which is deeper for Ca2RuO4+δ than for Ca1.8Sr0.2RuO4. Consequently, we found substantial differences from the Fermi surface of other ruthenates, shedding light on a unique role of excess oxygen among the metallization methods of Ca2RuO4.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{SUMIDA2021100628,

title = {Ultrafast surface Dirac fermion dynamics of Sb_{2}Te_{3}-based topological insulators},

author = {Kazuki Sumida and Yukiaki Ishida and Jens Güdde and Ulrich Höfer and Shik Shin and Akio Kimura},

url = {https://www.sciencedirect.com/science/article/pii/S0079681621000162},

doi = {https://doi.org/10.1016/j.progsurf.2021.100628},

issn = {0079-6816},

year  = {2021},

date = {2021-01-01},

urldate = {2021-01-01},

journal = {Progress in Surface Science},

volume = {96},

number = {2},

pages = {100628},

abstract = {Topological insulators (TIs) characterized by gapless and spin-polarized conical band dispersion on their surfaces have been extensively studied over the last decade. This article reviews our recent works on ultrafast carrier dynamics of Sb2Te3-based nonmagnetic and magnetic TIs by utilizing state-of-the-art femtosecond time- and angle-resolved photoelectron spectroscopy. We have demonstrated that the electronic recovery time elongated from a few ps to >400 ps in case that the Dirac point was close to the Fermi energy in the series of (Sb1-xBix)2Te3. We also investigated how the magnetic-impurity affects the carrier dynamics in ferromagnetic Sb2-yVyTe3. It was found that the electronic recovery time drastically shortened from a few ps to <500 fs with increasing vanadium concentration. Since the lifetime of the nonequilibrated surface Dirac fermions can range from femto- to nano-second, Sb2Te3-based TIs would be promising for ultrafast spin switching and spin-polarized current generation device applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sumida2020,

title = {Spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic Heusler films},

author = {Kazuki Sumida and Yuya Sakuraba and Keisuke Masuda and Takashi Kono and Masaaki Kakoki and Kazuki Goto and Weinan Zhou and Koji Miyamoto and Yoshio Miura and Taichi Okuda and Akio Kimura},

url = {https://doi.org/10.1038/s43246-020-00088-w},

doi = {10.1038/s43246-020-00088-w},

year  = {2020},

date = {2020-11-24},

journal = {Communications Materials},

volume = {1},

pages = {89},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.125.216403,

title = {Visualizing Half-Metallic Bulk Band Structure with Multiple Weyl Cones of the Heusler Ferromagnet},

author = {Takashi Kono and Masaaki Kakoki and Tomoki Yoshikawa and Xiaoxiao Wang and Kazuki Goto and Takayuki Muro and Rie Y. Umetsu and Akio Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.216403},

doi = {10.1103/PhysRevLett.125.216403},

year  = {2020},

date = {2020-11-01},

journal = {Phys. Rev. Lett.},

volume = {125},

pages = {216403},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevResearch.2.043120,

title = {Observation of unoccupied states of SnTe(111) using pump-probe ARPES measurement},

author = {Hiroshi Ito and Yusuke Otaki and Yuta Tomohiro and Yukiaki Ishida and Ryota Akiyama and Akio Kimura and Shik Shin and Shinji Kuroda},

url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.043120},

doi = {10.1103/PhysRevResearch.2.043120},

year  = {2020},

date = {2020-10-01},

journal = {Phys. Rev. Research},

volume = {2},

pages = {043120},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.102.125151,

title = {Experimental verification of a temperature-induced topological phase transition in TlBiS_{2} and TlBiSe_{2}},

author = {Takehito Imai and Jiahua Chen and Kazuki Kato and Kenta Kuroda and Teruo Matsuda and Akio Kimura and Koji Miyamoto and Sergey V. Eremeev and Taichi Okuda},

url = {https://link.aps.org/doi/10.1103/PhysRevB.102.125151},

doi = {10.1103/PhysRevB.102.125151},

year  = {2020},

date = {2020-09-01},

urldate = {2020-09-01},

journal = {Phys. Rev. B},

volume = {102},

pages = {125151},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Shikin2020,

title = {Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator MnBi_{2}Te_{4}},

author = {A. M. Shikin and D. A. Estyunin and I. I. Klimovskikh and S. O. Filnov and E. F. Schwier and S. Kumar and K. Miyamoto and T. Okuda and A. Kimura and K. Kuroda and K. Yaji and S. Shin and Y. Takeda and Y. Saitoh and Z. S. Aliev and N. T. Mamedov and I. R. Amiraslanov and M. B. Babanly and M. M. Otrokov and S. V. Eremeev and E. V. Chulkov},

url = {https://doi.org/10.1038/s41598-020-70089-9},

doi = {10.1038/s41598-020-70089-9},

year  = {2020},

date = {2020-08-06},

urldate = {2020-08-06},

journal = {Scientific Reports},

volume = {10},

pages = {13226},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Klimovskikh2020,

title = {Tunable 3D/2D magnetism in the (MnBi_{2}Te4)(Bi_{2}Te_{3})_{m} topological insulators family},

author = {Ilya I. Klimovskikh and Mikhail M. Otrokov and Dmitry Estyunin and Sergey V. Eremeev and Sergey O. Filnov and Alexandra Koroleva and Eugene Shevchenko and Vladimir Voroshnin and Artem G. Rybkin and Igor P. Rusinov and Maria Blanco-Rey and Martin Hoffmann and Ziya S. Aliev and Mahammad B. Babanly and Imamaddin R. Amiraslanov and Nadir A. Abdullayev and Vladimir N. Zverev and Akio Kimura and Oleg E. Tereshchenko and Konstantin A. Kokh and Luca Petaccia and Giovanni Di Santo and Arthur Ernst and Pedro M. Echenique and Nazim T. Mamedov and Alexander M. Shikin and Eugene V. Chulkov},

url = {https://doi.org/10.1038/s41535-020-00255-9},

doi = {10.1038/s41535-020-00255-9},

year  = {2020},

date = {2020-08-03},

urldate = {2020-08-03},

journal = {npj Quantum Materials},

volume = {5},

pages = {54},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.102.085149,

title = {Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi_{0.9}Gd_{0.1}Se_{2}},

author = {S. O. Filnov and I. I. Klimovskikh and D. A. Estyunin and A. V. Fedorov and V. Yu. Voroshnin and A. V. Koroleva and A. G. Rybkin and E. V. Shevchenko and Z. S. Aliev and M. B. Babanly and I. R. Amiraslanov and N. T. Mamedov and E. F. Schwier and K. Miyamoto and T. Okuda and S. Kumar and A. Kimura and V. M. Misheneva and A. M. Shikin and E. V. Chulkov},

url = {https://link.aps.org/doi/10.1103/PhysRevB.102.085149},

doi = {10.1103/PhysRevB.102.085149},

year  = {2020},

date = {2020-08-01},

urldate = {2020-08-01},

journal = {Phys. Rev. B},

volume = {102},

pages = {085149},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.102.064428,

title = {Unveiling spin-dependent unoccupied electronic states of Co_{2}MnGe(Ga) film via Ge(Ga) L_{2, 3} absorption spectroscopy},

author = {T. Yoshikawa and V. N. Antonov and T. Kono and M. Kakoki and K. Sumida and K. Miyamoto and Y. Takeda and Y. Saitoh and K. Goto and Y. Sakuraba and K. Hono and A. Ernst and A. Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.102.064428},

doi = {10.1103/PhysRevB.102.064428},

year  = {2020},

date = {2020-08-01},

urldate = {2020-08-01},

journal = {Phys. Rev. B},

volume = {102},

pages = {064428},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Nurmamat2020,

title = {Topologically Nontrivial Phase-Change Compound GeSb_{2}Te_{4}},

author = {Munisa Nurmamat and Kazuaki Okamoto and Siyuan Zhu and Tatiana V. Menshchikova and Igor P. Rusinov and Vladislav O. Korostelev and Koji Miyamoto and Taichi Okuda and Takeo Miyashita and Xiaoxiao Wang and Yukiaki Ishida and Kazuki Sumida and Eike F. Schwier and Mao Ye and Ziya S. Aliev and Mahammad B. Babanly and Imamaddin R. Amiraslanov and Evgueni V. Chulkov and Konstantin A. Kokh and Oleg E. Tereshchenko and Kenya Shimada and Shik Shin and Akio Kimura},

url = {https://doi.org/10.1021/acsnano.0c04145},

doi = {10.1021/acsnano.0c04145},

year  = {2020},

date = {2020-07-28},

urldate = {2020-07-28},

journal = {ACS Nano},

volume = {14},

pages = {9059-9065},

publisher = {American Chemical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kuroda2020,

title = {Devil's staircase transition of the electronic structures in CeSb},

author = {Kenta Kuroda and Y. Arai and N. Rezaei and S. Kunisada and S. Sakuragi and M. Alaei and Y. Kinoshita and C. Bareille and R. Noguchi and M. Nakayama and S. Akebi and M. Sakano and K. Kawaguchi and M. Arita and S. Ideta and K. Tanaka and H. Kitazawa and K. Okazaki and M. Tokunaga and Y. Haga and S. Shin and H. S. Suzuki and R. Arita and Takeshi Kondo},

url = {https://doi.org/10.1038/s41467-020-16707-6},

doi = {10.1038/s41467-020-16707-6},

year  = {2020},

date = {2020-06-08},

urldate = {2020-06-08},

journal = {Nature Communications},

volume = {11},

pages = {2888},

abstract = {Solids with competing interactions often undergo complex phase transitions with a variety of long-periodic modulations. Among such transition, devil's staircase is the most complex phenomenon, and for it, CeSb is the most famous material, where a number of the distinct phases with long-periodic magnetostructures sequentially appear below the Néel temperature. An evolution of the low-energy electronic structure going through the devil's staircase is of special interest, which has, however, been elusive so far despite 40 years of intense research. Here, we use bulk-sensitive angle-resolved photoemission spectroscopy and reveal the devil's staircase transition of the electronic structures. The magnetic reconstruction dramatically alters the band dispersions at each transition. Moreover, we find that the well-defined band picture largely collapses around the Fermi energy under the long-periodic modulation of the transitional phase, while it recovers at the transition into the lowest-temperature ground state. Our data provide the first direct evidence for a significant reorganization of the electronic structures and spectral functions occurring during the devil's staircase.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.101.161114,

title = {Three-dimensional electronic structure in ferromagnetic Fe_{3}Sn_{2} with breathing kagome bilayers},

author = {Hiroaki Tanaka and Yuita Fujisawa and Kenta Kuroda and Ryo Noguchi and Shunsuke Sakuragi and Cédric Bareille and Barnaby Smith and Cephise Cacho and Sung Won Jung and Takayuki Muro and Yoshinori Okada and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.101.161114},

doi = {10.1103/PhysRevB.101.161114},

year  = {2020},

date = {2020-04-01},

urldate = {2020-04-01},

journal = {Phys. Rev. B},

volume = {101},

issue = {16},

pages = {161114},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.124.136404,

title = {Radial Spin Texture in Elemental Tellurium with Chiral Crystal Structure},

author = {M. Sakano and M. Hirayama and T. Takahashi and S. Akebi and M. Nakayama and K. Kuroda and K. Taguchi and T. Yoshikawa and K. Miyamoto and T. Okuda and K. Ono and H. Kumigashira and T. Ideue and Y. Iwasa and N. Mitsuishi and K. Ishizaka and S. Shin and T. Miyake and S. Murakami and T. Sasagawa and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.124.136404},

doi = {10.1103/PhysRevLett.124.136404},

year  = {2020},

date = {2020-03-01},

journal = {Phys. Rev. Lett.},

volume = {124},

pages = {136404},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.101.104401,

title = {Manipulation of saturation magnetization and perpendicular magnetic anisotropy in epitaxial Co_{x}Mn_{4-x}N films with ferrimagnetic compensation},

author = {Keita Ito and Yoko Yasutomi and Siyuan Zhu and Munisa Nurmamat and Masaki Tahara and Kaoru Toko and Ryota Akiyama and Yukiharu Takeda and Yuji Saitoh and Tamio Oguchi and Akio Kimura and Takashi Suemasu},

url = {https://link.aps.org/doi/10.1103/PhysRevB.101.104401},

doi = {10.1103/PhysRevB.101.104401},

year  = {2020},

date = {2020-03-01},

urldate = {2020-03-01},

journal = {Phys. Rev. B},

volume = {101},

pages = {104401},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.101.104401b,

title = {Manipulation of saturation magnetization and perpendicular magnetic anisotropy in epitaxial Co_{x}Mn_{4-x}N films with ferrimagnetic compensation},

author = {Keita Ito and Yoko Yasutomi and Siyuan Zhu and Munisa Nurmamat and Masaki Tahara and Kaoru Toko and Ryota Akiyama and Yukiharu Takeda and Yuji Saitoh and Tamio Oguchi and Akio Kimura and Takashi Suemasu},

url = {https://link.aps.org/doi/10.1103/PhysRevB.101.104401},

doi = {10.1103/PhysRevB.101.104401},

year  = {2020},

date = {2020-03-01},

urldate = {2020-03-01},

journal = {Phys. Rev. B},

volume = {101},

pages = {104401},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.101.081104,

title = {Bulk quantum Hall effect of spin-valley coupled Dirac fermions in the polar antiferromagnet BaMnSb_{2}},

author = {H. Sakai and H. Fujimura and S. Sakuragi and M. Ochi and R. Kurihara and A. Miyake and M. Tokunaga and T. Kojima and D. Hashizume and T. Muro and K. Kuroda and Takeshi Kondo and T. Kida and M. Hagiwara and K. Kuroki and M. Kondo and K. Tsuruda and H. Murakawa and N. Hanasaki},

url = {https://link.aps.org/doi/10.1103/PhysRevB.101.081104},

doi = {10.1103/PhysRevB.101.081104},

year  = {2020},

date = {2020-02-01},

urldate = {2020-02-01},

journal = {Phys. Rev. B},

volume = {101},

pages = {081104},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{doi:10.1126/science.aay7311,

title = {Observation of small Fermi pockets protected by clean CuO_{2} sheets of a high-\textit{T}_{c} superconductor},

author = {So Kunisada and Shunsuke Isono and Yoshimitsu Kohama and Shiro Sakai and Cédric Bareille and Shunsuke Sakuragi and Ryo Noguchi and Kifu Kurokawa and Kenta Kuroda and Yukiaki Ishida and Shintaro Adachi and Ryotaro Sekine and Timur K. Kim and Cephise Cacho and Shik Shin and Takami Tohyama and Kazuyasu Tokiwa and Takeshi Kondo},

url = {https://www.science.org/doi/abs/10.1126/science.aay7311},

doi = {10.1126/science.aay7311},

year  = {2020},

date = {2020-01-01},

journal = {Science},

volume = {369},

pages = {833-838},

abstract = {Superconductivity in copper oxide materials emerges by doping a special kind of correlated state called the Mott insulator. However, studying what happens when a small concentration of charge carriers—holes or electrons—is added to a Mott insulator is experimentally challenging. It has been predicted that the so-called “Fermi pockets” should become visible during experimentation, but such pockets have not been unambiguously observed. Kunisada et al. studied the unusual cuprate Ba2Ca4Cu5O10(F,O)2, which has five copper oxide planes in a unit cell, whereas most cuprates have one or two (see the Perspective by Vishik). They observed two Fermi pockets in both photoemission and quantum oscillations data, with the innermost copper oxide planes playing a crucial role. Science, this issue p. 833; see also p. 775 Photoemission and quantum oscillations indicate Fermi pockets in a cuprate with five copper oxide planes per unit cell. In cuprate superconductors with high critical transition temperature (Tc), light hole-doping to the parent compound, which is an antiferromagnetic Mott insulator, has been predicted to lead to the formation of small Fermi pockets. These pockets, however, have not been observed. Here, we investigate the electronic structure of the five-layered Ba2Ca4Cu5O10(F,O)2, which has inner copper oxide (CuO2) planes with extremely low disorder, and find small Fermi pockets centered at (π/2, π/2) of the Brillouin zone by angle-resolved photoemission spectroscopy and quantum oscillation measurements. The d-wave superconducting gap opens along the pocket, revealing the coexistence between superconductivity and antiferromagnetic ordering in the same CuO2 sheet. These data further indicate that superconductivity can occur without contribution from the antinodal region around (π, 0), which is shared by other competing excitations.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.101.045430,

title = {Spectroscopic evidence of quasi-one-dimensional metallic Rashba spin-split states on the Si(111)5times2-Au surface},

author = {Kazuaki Taguchi and Kazuki Sumida and Yuki Okuda and Koji Miyamoto and Akio Kimura and Tamio Oguchi and Taichi Okuda},

url = {https://link.aps.org/doi/10.1103/PhysRevB.101.045430},

doi = {10.1103/PhysRevB.101.045430},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Phys. Rev. B},

volume = {101},

pages = {045430},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{doi:10.1063/1.5142846,

title = {Signatures of temperature driven antiferromagnetic transition in the electronic structure of topological insulator MnBi_{2}Te_{4}},

author = {D. A. Estyunin and I. I. Klimovskikh and A. M. Shikin and E. F. Schwier and M. M. Otrokov and A. Kimura and S. Kumar and S. O. Filnov and Z. S. Aliev and M. B. Babanly and E. V. Chulkov},

url = {https://doi.org/10.1063/1.5142846},

doi = {10.1063/1.5142846},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {APL Materials},

volume = {8},

number = {2},

pages = {021105},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{RYBKIN2020146687,

title = {A new approach for synthesis of epitaxial nano-thin Pt_{5}Gd alloy via intercalation underneath a graphene},

author = {Artem G. Rybkin and Anna A. Rybkina and Artem V. Tarasov and Dmitrii A. Pudikov and Ilya I. Klimovskikh and Oleg Yu. Vilkov and Anatoly E. Petukhov and Dmitry Yu. Usachov and Dmitrii A. Estyunin and Vladimir Yu. Voroshnin and Andrei Varykhalov and Giovanni Di Santo and Luca Petaccia and Eike F. Schwier and Kenya Shimada and Akio Kimura and Alexander M. Shikin},

url = {https://www.sciencedirect.com/science/article/pii/S0169433220314446},

doi = {https://doi.org/10.1016/j.apsusc.2020.146687},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Applied Surface Science},

volume = {526},

pages = {146687},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Otrokov2019,

title = {Prediction and observation of an antiferromagnetic topological insulator},

author = {M. M. Otrokov and I. I. Klimovskikh and H. Bentmann and D. Estyunin and A. Zeugner and Z. S. Aliev and S. Gaß and A. U. B. Wolter and A. V. Koroleva and A. M. Shikin and M. Blanco-Rey and M. Hoffmann and I. P. Rusinov and A. Yu. Vyazovskaya and S. V. Eremeev and Yu. M. Koroteev and V. M. Kuznetsov and F. Freyse and J. Sánchez-Barriga and I. R. Amiraslanov and M. B. Babanly and N. T. Mamedov and N. A. Abdullayev and V. N. Zverev and A. Alfonsov and V. Kataev and B. Büchner and E. F. Schwier and S. Kumar and A. Kimura and L. Petaccia and G. Di Santo and R. C. Vidal and S. Schatz and K. Kißner and M. Ünzelmann and C. H. Min and Simon Moser and T. R. F. Peixoto and F. Reinert and A. Ernst and P. M. Echenique and A. Isaeva and E. V. Chulkov},

url = {https://doi.org/10.1038/s41586-019-1840-9},

doi = {10.1038/s41586-019-1840-9},

year  = {2019},

date = {2019-12-01},

journal = {Nature},

volume = {576},

pages = {416-422},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.100.205140,

title = {Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS},

author = {Xiaoxiao Wang and Jiahua Chen and Mingtian Zheng and Tatiana V. Menshchikova and Igor P. Rusinov and Eike F. Schwier and Filip Orbaniifmmode acutecelse ćfi and Shilong Wu and Kazuki Sumida and Tomoki Yoshikawa and Koji Miyamoto and Munisa Nurmamat and Taichi Okuda and Kenya Shimada and Mario Novak and Evgueni V. Chulkov and Akio Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.205140},

doi = {10.1103/PhysRevB.100.205140},

year  = {2019},

date = {2019-11-01},

journal = {Phys. Rev. B},

volume = {100},

pages = {205140},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.100.165311,

title = {Bidirectional surface photovoltage on a topological insulator},

author = {T. Yoshikawa and K. Sumida and Y. Ishida and J. Chen and M. Nurmamat and K. Akiba and A. Miyake and M. Tokunaga and K. A. Kokh and O. E. Tereshchenko and S. Shin and A. Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.165311},

doi = {10.1103/PhysRevB.100.165311},

year  = {2019},

date = {2019-10-01},

journal = {Phys. Rev. B},

volume = {100},

pages = {165311},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.100.165120,

title = {Element-specific density of states of Co_{2}MnGe revealed by resonant photoelectron spectroscopy},

author = {Takashi Kono and Masaaki Kakoki and Tomoki Yoshikawa and Xiaoxiao Wang and Kazuki Sumida and Koji Miyamoto and Takayuki Muro and Yukiharu Takeda and Yuji Saitoh and Kazuki Goto and Yuya Sakuraba and Kazuhiro Hono and Akio Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.165120},

doi = {10.1103/PhysRevB.100.165120},

year  = {2019},

date = {2019-10-01},

urldate = {2019-10-01},

journal = {Phys. Rev. B},

volume = {100},

pages = {165120},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sumida_2019,

title = {Magnetic-impurity-induced modifications to ultrafast carrier dynamics in the ferromagnetic topological insulators Sb_{2-x}V_{x}Te_{3}},

author = {K Sumida and M Kakoki and J Reimann and M Nurmamat and S Goto and Y Takeda and Y Saitoh and K A Kokh and O E Tereshchenko and J Güdde and U Höfer and A Kimura},

url = {https://doi.org/10.1088/1367-2630/ab3ac6},

doi = {10.1088/1367-2630/ab3ac6},

year  = {2019},

date = {2019-09-01},

urldate = {2019-09-01},

journal = {New Journal of Physics},

volume = {21},

number = {9},

pages = {093006},

publisher = {IOP Publishing},

abstract = {Quantum anomalous Hall effect (QAHE) is a key phenomenon for low power-consumption device applications owing to its dissipationless spin-polarized and quantized current in the absence of an external magnetic field. However, the recorded working temperature of the QAHE is still very low. Here we systematically investigate the magnetic dopants induced modifications from the view points of magnetic, structural and electronic properties and the ultrafast carrier dynamics in a series of V-doped Sb2Te3 samples of composition Sb2−xVxTe3 with x = 0, 0.015 and 0.03. Element specific x-ray magnetic circular dichroism signifies that the ferromagnetism of V-doped Sb2Te3 is governed by the p–d hybridization between the host carrier and the magnetic dopant. Time- and angle-resolved photoemission spectroscopy excited with mid-infrared pulses has revealed that the V impurity induced states underlying the topological surface state (TSS) add scattering channels that significantly shorten the duration of transient surface electrons down to the 100 fs scale. This is in a sharp contrast to the prolonged duration reported for pristine samples though the TSS is located inside the bulk energy gap of the host in either magnetic or non-magnetic cases. It implies the presence of a mobility gap in the bulk energy gap region of the host material that would work toward the robust QAHE. Our findings shed light on the material design for low-energy-consuming device applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.100.085137,

title = {Highly anisotropic interlayer magnetoresitance in ZrSiS nodal-line Dirac semimetal},

author = {M. Novak and S. N. Zhang and F. Orbaniifmmode acutecelse ćfi and N. Biliifmmode checkselse šfikov and G. Eguchi and S. Paschen and A. Kimura and X. X. Wang and T. Osada and K. Uchida and M. Sato and Q. S. Wu and O. V. Yazyev and I. Kokanoviifmmode acutecelse ćfi},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.085137},

doi = {10.1103/PhysRevB.100.085137},

year  = {2019},

date = {2019-08-01},

journal = {Phys. Rev. B},

volume = {100},

pages = {085137},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.100.085137b,

title = {Highly anisotropic interlayer magnetoresitance in ZrSiS nodal-line Dirac semimetal},

author = {M. Novak and S. N. Zhang and F. Orbaniifmmode acutecelse ćfi and N. Biliifmmode checkselse šfikov and G. Eguchi and S. Paschen and A. Kimura and X. X. Wang and T. Osada and K. Uchida and M. Sato and Q. S. Wu and O. V. Yazyev and I. Kokanoviifmmode acutecelse ćfi},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.085137},

doi = {10.1103/PhysRevB.100.085137},

year  = {2019},

date = {2019-08-01},

journal = {Phys. Rev. B},

volume = {100},

pages = {085137},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.100.045133,

title = {Strongly anisotropic high-temperature Fermi surface of the Kondo semimetal CeNiSn revealed by angle-resolved photoemission spectroscopy},

author = {Cédric Bareille and T. -S. Nam and Toshiro Takabatake and Kenta Kuroda and Takeshi Yajima and Mitsuhiro Nakayama and So Kunisada and Shuntaro Akebi and Masato Sakano and Shunsuke Sakuragi and Ryo Noguchi and Byung Il Min and Shik Shin and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevB.100.045133},

doi = {10.1103/PhysRevB.100.045133},

year  = {2019},

date = {2019-07-01},

journal = {Phys. Rev. B},

volume = {100},

issue = {4},

pages = {045133},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Shikin2019,

title = {Dirac gap opening and Dirac-fermion-mediated magnetic coupling in antiferromagnetic Gd-doped topological insulators and their manipulation by synchrotron radiation},

author = {A. M. Shikin and D. A. Estyunin and Yu. I. Surnin and A. V. Koroleva and E. V. Shevchenko and K. A. Kokh and O. E. Tereshchenko and S. Kumar and E. F. Schwier and K. Shimada and T. Yoshikawa and Y. Saitoh and Y. Takeda and A. Kimura},

url = {https://doi.org/10.1038/s41598-019-41137-w},

doi = {10.1038/s41598-019-41137-w},

year  = {2019},

date = {2019-03-18},

journal = {Scientific Reports},

volume = {9},

pages = {4813},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.99.094308,

title = {Magnetic impurity mediated ultrafast electron dynamics in the carrier-density-tuned topological insulator V_{0.04}(B_{x}Sb_{1-x})_{2}Te_{3}},

author = {T. Xu and M. Wang and H. L. Zhu and W. J. Liu and T. C. Niu and A. Li and B. Gao and Y. Ishida and S. Shin and A. Kimura and M. Ye and S. Qiao},

url = {https://link.aps.org/doi/10.1103/PhysRevB.99.094308},

doi = {10.1103/PhysRevB.99.094308},

year  = {2019},

date = {2019-03-01},

urldate = {2019-03-01},

journal = {Phys. Rev. B},

volume = {99},

pages = {094308},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Noguchi2019,

title = {A weak topological insulator state in quasi-one-dimensional bismuth iodide},

author = {Ryo Noguchi and T. Takahashi and K. Kuroda and M. Ochi and T. Shirasawa and M. Sakano and C. Bareille and M. Nakayama and M. D. Watson and K. Yaji and A. Harasawa and H. Iwasawa and P. Dudin and T. K. Kim and M. Hoesch and V. Kandyba and A. Giampietri and A. Barinov and S. Shin and R. Arita and T. Sasagawa and Takeshi Kondo},

url = {https://doi.org/10.1038/s41586-019-0927-7},

doi = {10.1038/s41586-019-0927-7},

year  = {2019},

date = {2019-02-01},

urldate = {2019-02-01},

journal = {Nature},

volume = {566},

pages = {518-522},

abstract = {The major breakthroughs in understanding of topological materials over the past decade were all triggered by the discovery of the Z2-type topological insulator---a type of material that is insulating in its interior but allows electron flow on its surface. In three dimensions, a topological insulator is classified as either `strong' or `weak'1,2, and experimental confirmations of the strong topological insulator rapidly followed theoretical predictions3--5. By contrast, the weak topological insulator (WTI) has so far eluded experimental verification, because the topological surface states emerge only on particular side surfaces, which are typically undetectable in real three-dimensional crystals6--10. Here we provide experimental evidence for the WTI state in a bismuth iodide, $beta$-Bi4I4. Notably, the crystal has naturally cleavable top and side planes---stacked via van der Waals forces---which have long been desirable for the experimental realization of the WTI state11,12. As a definitive signature of this state, we find a quasi-one-dimensional Dirac topological surface state at the side surface (the (100) plane), while the top surface (the (001) plane) is topologically dark with an absence of topological surface states. We also find that a crystal transition from the $beta$-phase to the $alpha$-phase drives a topological phase transition from a nontrivial WTI to a normal insulator at roughly room temperature. The weak topological phase---viewed as quantum spin Hall insulators stacked three-dimensionally13,14---will lay a foundation for technology that benefits from highly directional, dense spin currents that are protected against backscattering.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.99.081108,

title = {Low-energy electron-mode couplings in the surface bands of Sr_{2}RuO_{4} revealed by laser-based angle-resolved photoemission spectroscopy},

author = {Shuntaro Akebi and Takeshi Kondo and Mitsuhiro Nakayama and Kenta Kuroda and So Kunisada and Haruka Taniguchi and Yoshiteru Maeno and Shik Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.99.081108},

doi = {10.1103/PhysRevB.99.081108},

year  = {2019},

date = {2019-02-01},

urldate = {2019-02-01},

journal = {Phys. Rev. B},

volume = {99},

issue = {8},

pages = {081108},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.99.085302,

title = {Inverted Dirac-electron population for broadband lasing in a thermally activated p-type topological insulator},

author = {K. Sumida and Y. Ishida and T. Yoshikawa and J. Chen and M. Nurmamat and K. A. Kokh and O. E. Tereshchenko and S. Shin and A. Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.99.085302},

doi = {10.1103/PhysRevB.99.085302},

year  = {2019},

date = {2019-02-01},

urldate = {2019-02-01},

journal = {Phys. Rev. B},

volume = {99},

pages = {085302},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhang2019,

title = {Multiple topological states in iron-based superconductors},

author = {Peng Zhang and Zhijun Wang and Xianxin Wu and Koichiro Yaji and Yukiaki Ishida and Yoshimitsu Kohama and Guangyang Dai and Yue Sun and Cedric Bareille and Kenta Kuroda and Takeshi Kondo and Kozo Okazaki and Koichi Kindo and Xiancheng Wang and Changqing Jin and Jiangping Hu and Ronny Thomale and Kazuki Sumida and Shilong Wu and Koji Miyamoto and Taichi Okuda and Hong Ding and G. D. Gu and Tsuyoshi Tamegai and Takuto Kawakami and Masatoshi Sato and Shik Shin},

url = {https://doi.org/10.1038/s41567-018-0280-z},

doi = {10.1038/s41567-018-0280-z},

year  = {2019},

date = {2019-01-01},

journal = {Nature Physics},

volume = {15},

pages = {41-47},

abstract = {Topological materials and unconventional iron-based superconductors are both important areas of study but, to date, relatively little overlap has been identified between these two fields. However, the combination of topological bands and superconductivity promises the manifestation of exotic superconducting states, including Majorana fermions, the central component of topological quantum computation. Here, using laser-based, spin-resolved and angle-resolved photoemission spectroscopy and density functional theory calculations, we have identified both topological insulator and Dirac semimetal states near the Fermi energy in different iron-based superconducting compounds. Carrier doping can tune these topologically non-trivial bands to the Fermi energy, potentially allowing access to several different superconducting topological states in the same material. These results reveal the generic coexistence of superconductivity and multiple topological states in iron-based superconductors, indicating that this broad class of materials is a promising platform for high-temperature topological superconductivity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.121.257201,

title = {Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO_{2}},

author = {Hirokazu Fujiwara and Kensei Terashima and Masanori Sunagawa and Yuko Yano and Takanobu Nagayama and Tetsushi Fukura and Fumiya Yoshii and Yuka Matsuura and Makoto Ogata and Takanori Wakita and Koichiro Yaji and Ayumi Harasawa and Kenta Kuroda and Shik Shin and Koji Horiba and Hiroshi Kumigashira and Yuji Muraoka and Takayoshi Yokoya},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.257201},

doi = {10.1103/PhysRevLett.121.257201},

year  = {2018},

date = {2018-12-01},

urldate = {2018-12-01},

journal = {Phys. Rev. Lett.},

volume = {121},

issue = {25},

pages = {257201},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.98.161102,

title = {Orbital-selective metal-insulator transition lifting the \textit{t}_{2g} band hybridization in the Hund metal Sr_{3}(Ru_{1-x}Mn_{x})_{2}O_{7}},

author = {M. Nakayama and Takeshi Kondo and K. Kuroda and C. Bareille and M. D. Watson and S. Kunisada and R. Noguchi and T. K. Kim and M. Hoesch and Y. Yoshida and S. Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.98.161102},

doi = {10.1103/PhysRevB.98.161102},

year  = {2018},

date = {2018-10-01},

urldate = {2018-10-01},

journal = {Phys. Rev. B},

volume = {98},

issue = {16},

pages = {161102},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Reimann2018,

title = {Subcycle observation of lightwave-driven Dirac currents in a topological surface band},

author = {J. Reimann and S. Schlauderer and C. P. Schmid and F. Langer and S. Baierl and K. A. Kokh and O. E. Tereshchenko and A. Kimura and C. Lange and J. Güdde and U. Höfer and R. Huber},

url = {https://doi.org/10.1038/s41586-018-0544-x},

doi = {10.1038/s41586-018-0544-x},

year  = {2018},

date = {2018-10-01},

journal = {Nature},

volume = {562},

pages = {396-400},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.2.104201,

title = {Enhanced surface state protection and band gap in the topological insulator PbBi_{4}Te_{4}S_{3}},

author = {K. Sumida and T. Natsumeda and K. Miyamoto and I. V. Silkin and K. Kuroda and K. Shirai and S. Zhu and K. Taguchi and M. Arita and J. Fujii and A. Varykhalov and O. Rader and V. A. Golyashov and K. A. Kokh and O. E. Tereshchenko and E. V. Chulkov and T. Okuda and A. Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.2.104201},

doi = {10.1103/PhysRevMaterials.2.104201},

year  = {2018},

date = {2018-10-01},

urldate = {2018-10-01},

journal = {Phys. Rev. Materials},

volume = {2},

pages = {104201},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{AU-Kuroda2018,

title = {Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser},

author = {Kenta Kuroda and Koichiro Yaji and Ayumi Harasawa and Ryo Noguchi and Takeshi Kondo and Fumio Komori and Shik Shin},

url = {https://doi.org/10.3791/57090},

doi = {10.3791/57090},

issn = {1940-087X},

year  = {2018},

date = {2018-06-28},

urldate = {2018-06-28},

journal = {JoVE},

number = {136},

pages = {e57090},

publisher = {MyJoVE Corp},

abstract = {The goal of this protocol is to present how to perform spin- and angle-resolved photoemission spectroscopy combined with polarization-variable 7-eV laser (laser-SARPES), and demonstrate a power of this technique for studying solid state physics. Laser-SARPES achieves two great capabilities. Firstly, by examining orbital selection rule of linearly polarized lasers, orbital selective excitation can be carried out in SAPRES experiment. Secondly, the technique can show full information of a variation of the spin quantum axis as a function of the light polarization. To demonstrate the power of the collaboration of these capabilities in laser-SARPES, we apply this technique for the investigations of spin-orbit coupled surface states of Bi2Se3. This technique affords to decompose spin and orbital components from the spin-orbit coupled wavefunctions. Moreover, as a representative advantage of using the direct spin detection collaborated with the polarization-variable laser, the technique unambiguously visualizes the light polarization dependence of the spin quantum axis in three-dimension. Laser-SARPES dramatically increases a capability of photoemission technique.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Nurmamat2018,

title = {Prolonged photo-carriers generated in a massive-and-anisotropic Dirac material},

author = {Munisa Nurmamat and Yukiaki Ishida and Ryohei Yori and Kazuki Sumida and Siyuan Zhu and Masashi Nakatake and Yoshifumi Ueda and Masaki Taniguchi and Shik Shin and Yuichi Akahama and Akio Kimura},

url = {https://doi.org/10.1038/s41598-018-27133-6},

doi = {10.1038/s41598-018-27133-6},

year  = {2018},

date = {2018-06-13},

journal = {Scientific Reports},

volume = {8},

pages = {9073},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.97.245407,

title = {Signatures of in-plane and out-of-plane magnetization generated by synchrotron radiation in magnetically doped and pristine topological insulators},

author = {A. M. Shikin and A. A. Rybkina and D. A. Estyunin and D. M. Sostina and V. Yu. Voroshnin and I. I. Klimovskikh and A. G. Rybkin and Yu. A. Surnin and K. A. Kokh and O. E. Tereshchenko and L. Petaccia and G. Di Santo and P. N. Skirdkov and K. A. Zvezdin and A. K. Zvezdin and A. Kimura and E. V. Chulkov and E. E. Krasovskii},

url = {https://link.aps.org/doi/10.1103/PhysRevB.97.245407},

doi = {10.1103/PhysRevB.97.245407},

year  = {2018},

date = {2018-06-01},

journal = {Phys. Rev. B},

volume = {97},

pages = {245407},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Akiyama_2018,

title = {Shubnikov–de Haas oscillations in \textit{p}- and \textit{n}-type topological insulator (Bi_{x}Sb_{1-x})_{2}Te_{3}},

author = {Ryota Akiyama and Kazuki Sumida and Satoru Ichinokura and Ryosuke Nakanishi and Akio Kimura and Konstantin A Kokh and Oleg E Tereshchenko and Shuji Hasegawa},

url = {https://doi.org/10.1088/1361-648x/aac59b},

doi = {10.1088/1361-648x/aac59b},

year  = {2018},

date = {2018-06-01},

urldate = {2018-06-01},

journal = {Journal of Physics: Condensed Matter},

volume = {30},

number = {26},

pages = {265001},

publisher = {IOP Publishing},

abstract = {We show Shubnikov–de Haas (SdH) oscillations in topological insulator (BixSb1−x)2Te3 flakes whose carrier types are p-type (x = 0.29, 0.34) and n-type (x = 0.42). The physical properties such as the Berry phase, carrier mobility, and scattering time significantly changed by tuning the Fermi-level position with the concentration x. The analyses of SdH oscillations by Landau-level fan diagram, Lifshitz–Kosevich theory, and Dingle-plot in the p-type samples with x = 0.29 and 0.34 showed the Berry phase of zero and a relatively low mobility (2000–6000 cm2 V−1 s−1). This is due to the dominant bulk component in transport. On the other hand, the mobility in the n-type sample with x = 0.42 reached a very large value ~17 000 cm2 V−1 s−1 and the Berry phase of near π, whereas the SdH oscillations were neither purely two- nor three-dimensional. These suggest that the transport channel has a surface-bulk coupling state which makes the carrier scattering lesser and enhances the mobility and has a character between two- and three-dimension.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.97.205113,

title = {Electronic and spin structure of the wide-band-gap topological insulator: Nearly stoichiometric Bi_{2}Te_{2}S},

author = {E. Annese and T. Okuda and E. F. Schwier and H. Iwasawa and K. Shimada and M. Natamane and M. Taniguchi and I. P. Rusinov and S. V. Eremeev and K. A. Kokh and V. A. Golyashov and O. E. Tereshchenko and E. V. Chulkov and A. Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.97.205113},

doi = {10.1103/PhysRevB.97.205113},

year  = {2018},

date = {2018-05-01},

urldate = {2018-05-01},

journal = {Phys. Rev. B},

volume = {97},

pages = {205113},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.97.115303,

title = {Ultrafast dynamics of an unoccupied surface resonance state in B_{2}Te_{2}Se},

author = {Nurmamat Munisa and E. E. Krasovskii and Y. Ishida and K. Sumida and Jiahua Chen and T. Yoshikawa and E. V. Chulkov and K. A. Kokh and O. E. Tereshchenko and S. Shin and Akio Kimura},

url = {https://link.aps.org/doi/10.1103/PhysRevB.97.115303},

doi = {10.1103/PhysRevB.97.115303},

year  = {2018},

date = {2018-03-01},

urldate = {2018-03-01},

journal = {Phys. Rev. B},

volume = {97},

pages = {115303},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.120.086402,

title = {Experimental Determination of the Topological Phase Diagram in Cerium Monopnictides},

author = {Kenta Kuroda and M. Ochi and H. S. Suzuki and M. Hirayama and M. Nakayama and R. Noguchi and C. Bareille and S. Akebi and S. Kunisada and T. Muro and M. D. Watson and H. Kitazawa and Y. Haga and T. K. Kim and M. Hoesch and S. Shin and R. Arita and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.120.086402},

doi = {10.1103/PhysRevLett.120.086402},

year  = {2018},

date = {2018-02-01},

urldate = {2018-02-01},

journal = {Phys. Rev. Lett.},

volume = {120},

pages = {086402},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.97.085433,

title = {Peculiar Rashba spin texture induced by \textit{C}_{3v} symmetry on the Bi(111) surface revisited},

author = {Koji Miyamoto and Hirokazu Miyahara and Kenta Kuroda and Takamasa Maegawa and Akio Kimura and Taichi Okuda},

url = {https://link.aps.org/doi/10.1103/PhysRevB.97.085433},

doi = {10.1103/PhysRevB.97.085433},

year  = {2018},

date = {2018-02-01},

urldate = {2018-02-01},

journal = {Phys. Rev. B},

volume = {97},

pages = {085433},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevMaterials.2.024407,

title = {Preferred site occupation of 3\textit{d} atoms in Ni_{x}Fe_{4-x}N (\textit{x}=1and 3) films revealed by x-ray absorption spectroscopy and magnetic circular dichroism},

author = {Fumiya Takata and Keita Ito and Yukiharu Takeda and Yuji Saitoh and Koki Takanashi and Akio Kimura and Takashi Suemasu},

url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.2.024407},

doi = {10.1103/PhysRevMaterials.2.024407},

year  = {2018},

date = {2018-02-01},

urldate = {2018-02-01},

journal = {Phys. Rev. Materials},

volume = {2},

pages = {024407},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.97.045112,

title = {Kondo hybridization and quantum criticality in YbAlB_{4} by laser ARPES},

author = {Cédric Bareille and Shintaro Suzuki and Mitsuhiro Nakayama and Kenta Kuroda and Andriy H. Nevidomskyy and Yosuke Matsumoto and Satoru Nakatsuji and Takeshi Kondo and Shik Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.97.045112},

doi = {10.1103/PhysRevB.97.045112},

year  = {2018},

date = {2018-01-01},

urldate = {2018-01-01},

journal = {Phys. Rev. B},

volume = {97},

issue = {4},

pages = {045112},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wu2017,

title = {Direct evidence of hidden local spin polarization in a centrosymmetric superconductor LaO_{0.55}F_{0.45}BiS_{2}},

author = {Shi-Long Wu and Kazuki Sumida and Koji Miyamoto and Kazuaki Taguchi and Tomoki Yoshikawa and Akio Kimura and Yoshifumi Ueda and Masashi Arita and Masanori Nagao and Satoshi Watauchi and Isao Tanaka and Taichi Okuda},

url = {https://doi.org/10.1038/s41467-017-02058-2},

doi = {10.1038/s41467-017-02058-2},

year  = {2017},

date = {2017-12-04},

urldate = {2017-12-04},

journal = {Nature Communications},

volume = {8},

pages = {1919},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kuroda2017,

title = {Evidence for magnetic Weyl fermions in a correlated metal},

author = {K. Kuroda and T. Tomita and M. -T. Suzuki and C. Bareille and A. A. Nugroho and P. Goswami and M. Ochi and M. Ikhlas and M. Nakayama and S. Akebi and R. Noguchi and R. Ishii and N. Inami and K. Ono and H. Kumigashira and A. Varykhalov and T. Muro and T. Koretsune and R. Arita and S. Shin and Takeshi Kondo and S. Nakatsuji},

url = {https://doi.org/10.1038/nmat4987},

doi = {10.1038/nmat4987},

year  = {2017},

date = {2017-11-01},

urldate = {2017-11-01},

journal = {Nature Materials},

volume = {16},

pages = {1090-1095},

abstract = {Experimental evidence for the realization of magnetic Weyl fermions in the strongly correlated metal Mn3Sn is reported.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.119.217001,

title = {Observation of Bogoliubov Band Hybridization in the Optimally Doped Trilayer Bi_{2}Sr_{2}Ca_{2}Cu_{3}O_{10+\textit{d}}},

author = {So Kunisada and Shintaro Adachi and Shiro Sakai and Nae Sasaki and Mitsuhiro Nakayama and Shuntaro Akebi and Kenta Kuroda and Takao Sasagawa and Takao Watanabe and Shik Shin and Takeshi Kondo},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.119.217001},

doi = {10.1103/PhysRevLett.119.217001},

year  = {2017},

date = {2017-11-01},

urldate = {2017-11-01},

journal = {Phys. Rev. Lett.},

volume = {119},

issue = {21},

pages = {217001},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sumida2017,

title = {Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators},

author = {K. Sumida and Y. Ishida and S. Zhu and M. Ye and A. Pertsova and C. Triola and K. A. Kokh and O. E. Tereshchenko and A. V. Balatsky and S. Shin and A. Kimura},

url = {https://doi.org/10.1038/s41598-017-14308-w},

doi = {10.1038/s41598-017-14308-w},

year  = {2017},

date = {2017-10-26},

journal = {Scientific Reports},

volume = {7},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.95.241108,

title = {Experimental realization of type-II Weyl state in noncentrosymmetric TaIrTe_{4}},

author = {E. Haubold and K. Koepernik and D. Efremov and S. Khim and A. Fedorov and Y. Kushnirenko and J. Brink and S. Wurmehl and B. Büchner and T. K. Kim and M. Hoesch and K. Sumida and K. Taguchi and T. Yoshikawa and A. Kimura and T. Okuda and S. V. Borisenko},

url = {https://link.aps.org/doi/10.1103/PhysRevB.95.241108},

doi = {10.1103/PhysRevB.95.241108},

year  = {2017},

date = {2017-06-01},

urldate = {2017-06-01},

journal = {Phys. Rev. B},

volume = {95},

pages = {241108},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Yaji2017,

title = {Spin-dependent quantum interference in photoemission process from spin-orbit coupled states},

author = {Koichiro Yaji and Kenta Kuroda and Sogen Toyohisa and Ayumi Harasawa and Yukiaki Ishida and Shuntaro Watanabe and Chuangtian Chen and Katsuyoshi Kobayashi and Fumio Komori and Shik Shin},

url = {https://doi.org/10.1038/ncomms14588},

doi = {10.1038/ncomms14588},

year  = {2017},

date = {2017-02-24},

journal = {Nature Communications},

volume = {8},

pages = {14588},

abstract = {Spin--orbit interaction entangles the orbitals with the different spins. The spin--orbital-entangled states were discovered in surface states of topological insulators. However, the spin--orbital-entanglement is not specialized in the topological surface states. Here, we show the spin--orbital texture in a surface state of Bi(111) by laser-based spin- and angle-resolved photoelectron spectroscopy (laser-SARPES) and describe three-dimensional spin-rotation effect in photoemission resulting from spin-dependent quantum interference. Our model reveals that, in the spin--orbit-coupled systems, the spins pointing to the mutually opposite directions are independently locked to the orbital symmetries. Furthermore, direct detection of coherent spin phenomena by laser-SARPES enables us to clarify the phase of the dipole transition matrix element responsible for the spin direction in photoexcited states. These results permit the tuning of the spin polarization of optically excited electrons in solids with strong spin--orbit interaction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.95.081103,

title = {Ultrafast energy- and momentum-resolved surface Dirac photocurrents in the topological insulator Sb_{2}Te_{3}},

author = {Kenta Kuroda and J. Reimann and K. A. Kokh and O. E. Tereshchenko and A. Kimura and J. Güdde and U. Höfer},

url = {https://link.aps.org/doi/10.1103/PhysRevB.95.081103},

doi = {10.1103/PhysRevB.95.081103},

year  = {2017},

date = {2017-02-01},

urldate = {2017-02-01},

journal = {Phys. Rev. B},

volume = {95},

pages = {081103},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.95.041111,

title = {Direct mapping of spin and orbital entangled wave functions under interband spin-orbit coupling of giant Rashba spin-split surface states},

author = {Ryo Noguchi and Kenta Kuroda and K. Yaji and K. Kobayashi and M. Sakano and A. Harasawa and Takeshi Kondo and F. Komori and S. Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.95.041111},

doi = {10.1103/PhysRevB.95.041111},

year  = {2017},

date = {2017-01-01},

journal = {Phys. Rev. B},

volume = {95},

issue = {4},

pages = {041111},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.117.247001,

title = {Orbital-Dependent Band Narrowing Revealed in an Extremely Correlated Hund's Metal Emerging on the Topmost Layer of Sr_{2}RuO_{4}},

author = {Takeshi Kondo and M. Ochi and M. Nakayama and H. Taniguchi and S. Akebi and K. Kuroda and M. Arita and S. Sakai and H. Namatame and M. Taniguchi and Y. Maeno and R. Arita and S. Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.117.247001},

doi = {10.1103/PhysRevLett.117.247001},

year  = {2016},

date = {2016-12-01},

urldate = {2016-12-01},

journal = {Phys. Rev. Lett.},

volume = {117},

issue = {24},

pages = {247001},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.94.195134,

title = {Spin texture in type-II Weyl semimetal WTe_{2}},

author = {Baojie Feng and Yang-Hao Chan and Ya Feng and Ro-Ya Liu and Mei-Yin Chou and Kenta Kuroda and Koichiro Yaji and Ayumi Harasawa and Paolo Moras and Alexei Barinov and Walid Malaeb and Cédric Bareille and Takeshi Kondo and Shik Shin and Fumio Komori and Tai-Chang Chiang and Youguo Shi and Iwao Matsuda},

url = {https://link.aps.org/doi/10.1103/PhysRevB.94.195134},

doi = {10.1103/PhysRevB.94.195134},

year  = {2016},

date = {2016-11-01},

urldate = {2016-11-01},

journal = {Phys. Rev. B},

volume = {94},

issue = {19},

pages = {195134},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevB.94.165162,

title = {Coherent control over three-dimensional spin polarization for the spin-orbit coupled surface state of Bi_{2}Se_{3}},

author = {Kenta Kuroda and Koichiro Yaji and M. Nakayama and A. Harasawa and Y. Ishida and S. Watanabe and C. -T. Chen and T. Kondo and F. Komori and S. Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevB.94.165162},

doi = {10.1103/PhysRevB.94.165162},

year  = {2016},

date = {2016-10-01},

urldate = {2016-10-01},

journal = {Phys. Rev. B},

volume = {94},

issue = {16},

pages = {165162},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.117.056403,

title = {Slater to Mott Crossover in the Metal to Insulator Transition of Nd_{2}Ir_{2}O_{7}},

author = {M. Nakayama and Takeshi Kondo and Z. Tian and J. J. Ishikawa and M. Halim and C. Bareille and W. Malaeb and K. Kuroda and T. Tomita and S. Ideta and K. Tanaka and M. Matsunami and S. Kimura and N. Inami and K. Ono and H. Kumigashira and L. Balents and S. Nakatsuji and S. Shin},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.117.056403},

doi = {10.1103/PhysRevLett.117.056403},

year  = {2016},

date = {2016-07-01},

urldate = {2016-07-01},

journal = {Phys. Rev. Lett.},

volume = {117},

issue = {5},

pages = {056403},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.116.096801,

title = {Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs},

author = {Su-Yang Xu and Ilya Belopolski and Daniel S. Sanchez and Madhab Neupane and Guoqing Chang and Koichiro Yaji and Zhujun Yuan and Chenglong Zhang and Kenta Kuroda and Guang Bian and Cheng Guo and Hong Lu and Tay-Rong Chang and Nasser Alidoust and Hao Zheng and Chi-Cheng Lee and Shin-Ming Huang and Chuang-Han Hsu and Horng-Tay Jeng and Arun Bansil and Titus Neupert and Fumio Komori and Takeshi Kondo and Shik Shin and Hsin Lin and Shuang Jia and M. Zahid Hasan},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.116.096801},

doi = {10.1103/PhysRevLett.116.096801},

year  = {2016},

date = {2016-03-01},

journal = {Phys. Rev. Lett.},

volume = {116},

issue = {9},

pages = {096801},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevLett.116.076801,

title = {Generation of Transient Photocurrents in the Topological Surface State of Sb_{2}Te_{3} by Direct Optical Excitation with Midinfrared Pulses},

author = {K. Kuroda and J. Reimann and J. Güdde and U. Höfer},

url = {https://link.aps.org/doi/10.1103/PhysRevLett.116.076801},

doi = {10.1103/PhysRevLett.116.076801},

year  = {2016},

date = {2016-02-01},

journal = {Phys. Rev. Lett.},

volume = {116},

pages = {076801},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}