Yaji Koichiro

Affiliation and department：

Research field (2)： Magnetism, superconductivity, and strongly correlated systems , Semiconductors, optical and atomic physics

Research keywords (3)： photoemission spectroscopy , surface physics , electronic physics

Research theme for competitive and other funds (11)：

2019 - 2022 Cross-sectional research for opt-spintronics explored by time-, spin- and angle-resolved photoemission
2019 - 2022 強相関トポロジカル結晶のスピン偏極表面状態のSTM及びSARPESによる研究
2018 - 2021 強相関トポロジカル結晶のスピン偏極表面状態のSTM及びSARPESによる研究
2018 - 2021 スピン分解光電子分光の基礎理論の構築に向けた光電子スピン干渉の研究
2019 - 2020 単体トポロジカル超伝導体の物質探査と電子状態の研究

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Papers (119)：

Takahiro Kobayashi, Yuichiro Toichi, Koichiro Yaji, Yoshitaka Nakata, Yuchi Yaoita, Mutsuki Iwaoka, Mariko Koga, Yituo Zhang, Jun Fujii, Shimpei Ono, et al. Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal. Nano Letters. 2023. 23. 16. 7675-7682
Kaishu Kawaguchi, Kenta Kuroda, Z. Zhao, S. Tani, A. Harasawa, Y. Fukushima, H. Tanaka, R. Noguchi, T. Iimori, K. Yaji, et al. Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser. Review of Scientific Instruments. 2023. 94. 8
Rena Moue, Hiroto Yamazaki, Tatsuya Kitazawa, Koichiro Yaji, Hiroshi Yaguchi, Kenta Kuroda, Takeshi Kondo, Ayumi Harasawa, Takashi Iwahashi, Yukio Ouchi, et al. Topological Surface State of Bi2Se3 Modified by Physisorption of n-Alkane. ChemNanoMat. 2023
Hirokazu Fujiwara, Kensei Terashima, Junya Otsuki, Nayuta Takemori, Harald O. Jeschke, Takanori Wakita, Yuko Yano, Wataru Hosoda, Noriyuki Kataoka, Atsushi Teruya, et al. Anomalously large spin-dependent electron correlation in the nearly half-metallic ferromagnet CoS2. Physical Review B. 2022. 106. 8. 085114
Takuto Nakamura, Yoshiyuki Ohtsubo, Ayumi Harasawa, Koichiro Yaji, Shik Shin, Fumio Komori, Shin-ichi Kimura. Fluctuating spin-orbital texture of Rashba-split surface states in real and reciprocal space. Physical Review B. 2022. 105. 23

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MISC (94)：

川口海周, 黒田健太, 福島優斗, 田中宏明, 原沢あゆみ, 飯盛拓嗣, 趙智剛, 谷峻太郎, KOKH K. A., TERESHENKO O. E., et al. 時間・スピン・角度分解光電子分光装置の開発とスピン偏極表面状態の光励起ダイナミクス観測. 日本放射光学会年会・放射光科学合同シンポジウム(Web). 2022. 35th
福島優斗, 川口海周, 黒田健太, 田中宏明, 原沢あゆみ, 飯盛拓嗣, ZHAO Z., 谷峻太郎, 矢治光一郎, 辛埴, et al. Observation of spin-polarized surface state of Bi(111) studied by time-, spin- and angle-resolved photoemission spectroscopy. 日本物理学会講演概要集(CD-ROM). 2022. 77. 1
川口海周, 福島優斗, 黒田健太, 田中宏明, 原沢あゆみ, 飯盛拓嗣, ZHAO Zhingang, 谷峻太郎, KOKH K. A., TERESHENKO O. E., et al. Time-, spin, and angle-resolved photoemission spectroscopy measurements of photo-induced dynamics on spin-polarized electronic states. 日本物理学会講演概要集(CD-ROM). 2021. 76. 2
川口海周, 黒田健太, ZHAO Zhigang, 谷俊太郎, 原沢あゆみ, 矢治光一郎, 野口亮, 藤澤正美, 辛埴, 小森文夫, et al. Polarization-dependent spin-resolved ARPES study of topological surface states with 10.7 eV laser. 日本物理学会講演概要集(CD-ROM). 2021. 76. 1
福島優斗, 川口海周, 黒田健太, 田中宏明, 原沢あゆみ, 飯盛拓嗣, ZHAO Z., 谷峻太郎, 矢治光一郎, 笹川崇男, et al. Observation of unoccupied electronic states by time-, spin, and angle-resolved photoemission spectroscopy and improvement of time resolution by chirp optimization. 日本物理学会講演概要集(CD-ROM). 2021. 76. 2

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Lectures and oral presentations (49)：

Spin-polarized surface states and symmetry of graphene/Sn/SiC(0001)
(Abstract book of Annual Meeting of the Japan Society of Vacuum and Surface Science 2019)
表面一次元原子鎖Au/Ge(001)の二次元電子状態 II
(日本物理学会講演概要集(CD-ROM) 2018)
レーザー励起スピン分解光電子分光で解き明かす光スピン制御
(光学 2018)
Spin-orbital entanglement of Shockley-type surface states on noble metals (111) studied by laser-SARPES
(Meeting Abstracts of the Physical Society of Japan 2017)
Spin polarization of surface states and photoelectrons of Pb/Ge(111) studied by laser-SARPES with tunable photon polarization
(Meeting Abstracts of the Physical Society of Japan 2017)

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Education (1)：

2003 - 2006 Hiroshima University Graduate School of Science Department of Physical Science

Professional career (1)：

理学(博士)

Work history (6)：

2021/04 - 現在 National Institute for Materials Science Research Center for Advanced Measurement and Characterization Group leader
2020/04 - 2021/03 National Institute for Materials Science Research Center for Advanced Measurement and Characterization Senior Researcher
2010/09 - 2020/03 University of Tokyo Institute for Solid State Physics research associate
2008/04 - 2010/08 Kyoto Univeristy Graduate School of Science Postdoctoral Researcher
2006/04 - 2008/03 University of Tokyo Institute for Solid State Physics Postdoctoral Researcher

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Committee career (4)：

2020/10 - 2022/09 日本放射光学会編集委員
2019/10 - 2020/09 日本物理学会領域9世話人
2019/04 - 2020/03 日本放射光学会組織委員
2012/04 - 2014/03 日本放射光学会行事委員

Awards (4)：

2018/10 - 14th International Conference on Electronic Spectroscopy and Structure Best poster prize Spin polarization of photoelectron emitted from spin-orbit coupled surface states investigated by laser-SARPES
2013/04 - 日本物理学会若手奨励賞(領域9)
2010/05 - 日本表面科学会第29回表面科学学術講演大会講演奨励賞(若手研究者部門) 4/3原子層鉛吸着Ge(111)表面のラッシュバ分裂した電子状態
2009/10 - Best poster prize Rashba spin splitting of metallic surface state for 4/3-monolayer Pb/Ge(111)

Association Membership(s) (3)：

THE JAPANESE SOCIETY FOR SYNCHROTRON RADIATION RESEARCH , THE SURFACE SCIENCE SOCIETY OF JAPAN , THE PHYSICAL SOCIETY OF JAPAN

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