KY
Koichiro Yaji
cond-mat.mtrl-scicond-mat.mes-hallcond-mat.str-elcond-mat.supr-conanisotropic magnetoresistance effectARPESbilayer materialCo2MnSicomposition-spread filmscond-mat.other
On Valency
published · living versionsW_en9zck9r·v1 · currentpublished
Direct observation of a spin-polarized surface Dirac gap in the antiferromagnetic topological insulator NdBi
with Yuto Fukushima, Hiroyuki S. Suzuki, Masayuki Ochi, Takuma Nishida +13
1 version
Preprints & journals
64 papers in the corpus · 2004–2026Direct observation of the electronic structure of even-layer puckered SnTe monolayer films on graphene2609.27672v1 · Satoru Ichinokura, Shunsuke Tsuda, Kiyohisa Tanaka et al.2026 · 0 citationsPhys. Rev. B 114, 165408 (2026)
Direct observation of a spin-polarized surface Dirac gap in the antiferromagnetic topological insulator NdBi.42881155 · Fukushima, Yuto, Suzuki, Hiroyuki S, Ochi, Masayuki et al.2026 · 0 citationsNature communications. 2026;17(1)
Anomaly detection of fermi surface morphology in Co2MnGaxGe1-x via interpretable machine learning.42045268 · Ishikawa, Daichi, Fuku, Kentaro, Miura, Yoshio et al.2026 · 0 citationsScientific reports. 2026;16(1)
Momentum-dependent charge-density-wave gap formation in ZrTe_2.98Se_0.022604.12326v1 · Iori Ishiguro, Hayate Kunitsu, Natsuki Mitsuishi et al.2026 · 0 citationsarXiv
Fermi surface of Kagome metal CsCrSb observed by laser photoemission microscopy2603.18672v1 · Hayate Kunitsu, Iori Ishiguro, Natsuki Mitsuishi et al.2026 · 0 citationsarXiv
Origin of two-dimensional MXene/ferromagnetic interface evaluated by angle-dependent hard X-ray photoemission spectroscopy.40917642 · Kumar, Prabhat, Tsuda, Shunsuke, Yaji, Koichiro et al.2025 · 2 citationsScience and technology of advanced materials. 2025;26(1):2551484
Induced magnetic moment at two-dimensional MXene/ferromagnetic interface evaluated by angle-dependent hard X-ray photoemission spectroscopy2504.10934v1 · Prabhat Kumar, Shunsuke Tsuda, Koichiro Yaji et al.2025 · 0 citationsarXiv
Topological delocalization against Anderson localization observed in Bi-doped PbSb2Te4 disordered topological insulator2504.01343v1 · Yuya Hattori, Koichiro Yaji, Keisuke Sagisaka et al.2025 · 0 citationsarXiv
High-throughput evaluation of half-metallicity of Co2MnSi Heusler alloys using composition-spread films and spin-integrated hard X-ray photoelectron spectroscopy.39802280 · Toyama, Ryo, Tsuda, Shunsuke, Iwasaki, Yuma et al.2025 · 3 citationsScience and technology of advanced materials. 2025;26(1):2439781
Visualization of spin-polarized surface resonances in Pb-based ternary topological insulators.39468187 · Yaji, Koichiro, Hattori, Yuya, Yoshizawa, Shunsuke et al.2024 · 0 citationsScientific reports. 2024;14(1):25868
Spin polarization of photoelectrons emitted from spin-orbit coupled surface states of Pb/Ge(111).38661285 · Yaji, Koichiro, Kuroda, Kenta, Tsuda, Shunsuke et al.2024 · 1 citationMicroscopy (Oxford, England). 2024;73(5):439-445
Moiré superlattices of antimonene on a Bi(111) substrate with van Hove singularity and Rashba-type spin polarization2404.05142v2 · Tomonori Nakamura, Yitao Chen, Ryohei Nemoto et al.2024 · 4 citationsCommun. Mater. 5, 167 (2024)
Visualization of spin-polarized electronic states by imaging-type spin-resolved photoemission microscopy2312.13571v1 · Koichiro Yaji, Shunsuke Tsuda2023 · 11 citationsarXiv
Anomalously large spin-dependent electron correlation in nearly half-metallic ferromagnet CoS2310.07274v1 · Hirokazu Fujiwara, Kensei Terashima, Junya Otsuki et al.2023 · 9 citationsPhysical Review B 106, 085114 (2022)
Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal.37578323 · Kobayashi, Takahiro, Toichi, Yuichiro, Yaji, Koichiro et al.2023 · 8 citationsNano letters. 2023;23(16):7675-7682
Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser.37540119 · Kawaguchi, Kaishu, Kuroda, Kenta, Zhao, Z et al.2023 · 15 citationsThe Review of scientific instruments. 2023;94(8)
Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES2303.17816v1 · Yuto Fukushima, Kaishu Kawaguchi, Kenta Kuroda et al.2023 · 0 citationsarXiv
Coexistence of Strong and Weak Topological Orders in a Quasi-One-Dimensional Material.36240409 · Wang, De-Yang, Jiang, Qi, Kuroda, Kenta et al.2022 · 13 citationsPhysical review letters. 2022;129(14):146401
Rhombic Fermi surfaces in a ferromagnetic MnGa thin film with perpendicular magnetic anisotropy2203.12182v1 · M. Kobayashi, N. H. D. Khang, T. Takeda et al.2022 · 2 citationsPhys. Rev. Materials 6, 074403 (2022)
Fluctuated spin-orbital texture of Rashba-split surface states in real and reciprocal space2112.13496v1 · Takuto Nakamura, Yoshiyuki Ohtsubo, Ayumi Harasawa et al.2021 · 2 citationsPhys. Rev. B 105, 235141 (2022)
Selective observation of surface and bulk bands in polar WTe2 by laser-based spin- and angle-resolved photoemission spectroscopy2110.10944v1 · Yuxuan Wan, Lihai Wang, Kenta Kuroda et al.2021 · 5 citationsarXiv
Visualization of optical polarization transfer to photoelectron spin vector emitted from the spin-orbit coupled surface state2105.02749v2 · Kenta Kuroda, Koichiro Yaji, Ryo Noguchi et al.2021 · 3 citationsPhys. Rev. B 105, L121106 (2022)
Atomic-layer Rashba-type superconductor protected by dynamic spin-momentum locking2103.07143v1 · Shunsuke Yoshizawa, Takahiro Kobayashi, Yoshitaka Nakata et al.2021 · 41 citationsNat Commun 12, 1462 (2021)
Evidence for a higher-order topological insulator in a three-dimensional material built from van der Waals stacking of bismuth-halide chains.33398124 · Noguchi, Ryo, Kobayashi, Masaru, Jiang, Zhanzhi et al.2026 · 172 citationsNature materials. 2021;20(4):473-479
Scaling law for the Rashba-type spin splitting in quantum well films2012.11289v1 · Ryo Noguchi, Kenta Kuroda, Mitsuaki Kawamura et al.2020 · 2 citationsarXiv
Observation and control of the weak topological insulator state in ZrTe52012.04989v1 · Peng Zhang, Ryo Noguchi, Kenta Kuroda et al.2020 · 100 citationsNature Communications 12, 406 (2021)
Orbital Angular Momentum Induced Spin Polarization of 2D Metallic Bands.33156655 · Kobayashi, Takahiro, Nakata, Yoshitaka, Yaji, Koichiro et al.2020 · 23 citationsPhysical review letters. 2020;125(17):176401
Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator
MnBi
2
Te
4
.32764583 · Shikin, A M, Estyunin, D A, Klimovskikh, I I et al.2026 · 97 citationsScientific reports. 2020;10(1):13226
Publisher Correction: A weak topological insulator state in quasi-one-dimensional bismuth iodide.32690939 · Noguchi, Ryo, Takahashi, T, Kuroda, K et al.2020 · 0 citationsNature. 2020;584(7819):E4
Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator MnBiTe2004.04802v1 · A.M. Shikin, D.A. Estyunin, I.I. Klimovskikh et al.2020 · 7 citationsarXiv
Fermi level tuning of one-dimensional giant Rashba system on a semiconductor substrate: Bi/GaSb(110)-(2x1)1909.13438v2 · Takuto Nakamura, Yoshiyuki Ohtsubo, Naoki Tokumasu et al.2019 · 4 citationsPhys. Rev. Materials 3, 126001 (2019)
Coexistence of Two Types of Spin Splitting Originating from Different Symmetries.30978076 · Yaji, Koichiro, Visikovskiy, Anton, Iimori, Takushi et al.2019 · 22 citationsPhysical review letters. 2019;122(12):126403
A weak topological insulator state in quasi-one-dimensional bismuth iodide.30742073 · Noguchi, Ryo, Takahashi, T, Kuroda, K et al.2021 · 174 citationsNature. 2019;566(7745):518-522
Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO_2.30608774 · Fujiwara, Hirokazu, Terashima, Kensei, Sunagawa, Masanori et al.2019 · 12 citationsPhysical review letters. 2018;121(25):257201
Multiple topological states in iron-based superconductors1809.09977v1 · Peng Zhang, Zhijun Wang, Xianxin Wu et al.2018 · 287 citationsNature Physics 15, 41 (2019)
Computational study of heavy group IV elements (Ge, Sn, Pb) triangular lattice atomic layers on SiC(0001) surface1809.00829v1 · Anton Visikovskiy, Shingo Hayashi, Takashi Kajiwara et al.2018 · 3 citationsarXiv
Rashba spin splitting of L-gap surface states on Ag(111) and Cu(111)1807.06224v1 · Koichiro Yaji, Ayumi Harasawa, Kenta Kuroda et al.2018 · 42 citationsPhys. Rev. B 98, 041404(R) (2018)
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser.30010669 · Kuroda, Kenta, Yaji, Koichiro, Harasawa, Ayumi et al.2018 · 6 citationsJournal of visualized experiments : JoVE. 2018(136)
Giant Rashba splitting of quasi-1D surface states on Bi/InAs(110)-(2$\times$1)1804.07012v3 · T. Nakamura, Y. Ohtsubo, Y. Yamashita et al.2018 · 20 citationsPhys. Rev. B 98, 075431 (2018)
Observation of topological superconductivity on the surface of an iron-based superconductor.29519917 · Zhang, Peng, Yaji, Koichiro, Hashimoto, Takahiro et al.2018 · 727 citationsScience (New York, N.Y.). 2018;360(6385):182-186
Topological Dirac semimetal phase in the iron-based superconductor Fe(Te,Se)1803.00845v1 · Peng Zhang, Zhijun Wang, Yukiaki Ishida et al.2018 · 1 citationPart of Nature Physics 15, 41 (2019) (See also arXiv 1809.09977)
Direct observation of multiple topological phases in the iron-based superconductor Li(Fe,Co)As1803.00846v1 · Peng Zhang, Xianxin Wu, Koichiro Yaji et al.2018 · 2 citationsPart of Nature Physics 15, 41 (2019) (See also arXiv 1809.09977)
Surface electronic states of Au-induced nanowires on Ge(0 0 1).29300177 · Yaji, Koichiro, Yukawa, Ryu, Kim, Sunghun et al.2018 · 5 citationsJournal of physics. Condensed matter : an Institute of Physics journal. 2018;30(7):075001
Modulation of Electron-Phonon Coupling in One-Dimensionally Nanorippled Graphene on a Macrofacet of 6H-SiC.28520435 · Ienaga, Koichiro, Iimori, Takushi, Yaji, Koichiro et al.2018 · 14 citationsNano letters. 2017;17(6):3527-3532
Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb.28508059 · Ma, Junzhang, Yi, Changjiang, Lv, Baiqing et al.2018 · 161 citationsScience advances. 2017;3(5):e1602415
Spin-polarized quasi 1D state with finite bandgap on the Bi/InSb(001) surface1704.05258v2 · J. Kishi, Y. Ohtsubo, T. Nakamura et al.2017 · 3 citationsPhys. Rev. Materials 1, 064602 (2017)
Spin-dependent quantum interference in photoemission process from spin-orbit coupled states.28232721 · Yaji, Koichiro, Kuroda, Kenta, Toyohisa, Sogen et al.2018 · 49 citationsNature communications. 2017;8:14588
Topologically Entangled Rashba-Split Shockley States on the Surface of Grey Arsenic.28186797 · Zhang, Peng, Ma, J-Z, Ishida, Y et al.2018 · 37 citationsPhysical review letters. 2017;118(4):046802
Direct Mapping of Spin and Orbital Entangled Wavefunction under Interband Spin-Orbit coupling of Rashba Spin-Split Surface States1701.07269v1 · Ryo Noguchi, Kenta Kuroda, K. Yaji et al.2017 · 41 citationsPhys. Rev. B 95, 041111(R)(2017)
High repetition pump-and-probe photoemission spectroscopy based on a compact fiber laser system1612.03026v1 · Y. Ishida, T. Otsu, A. Ozawa et al.2016 · 24 citationsRev. Sci. Instrum. 87, 123902 (2016)
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