Spin-orbital entanglement and photo-excited dynamics investigated by laser photoemission spectroscopy

• Project/Area Number: 17K14319
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: Kuroda Kenta 東京大学, 物性研究所, 助教 (00774001)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: スピン軌道相互作用 / スピン分解光電子分光 / レーザー / スピントロニクス / 表面・界面物性 / 超高速 / スピン軌道結合 / 電子スピン構造 / トポロジカル物質 / パルスレーザー / ポンププローブ法 / 半導体物性

Outline of Final Research Achievements

Spin-orbit coupling in matter is a key for recent development of spintronics to generate spin-polarized electrons related to band topology as well as control the electron’s spin. In this work, we use ARPES-based techniques to search new material phases induced by strong spin-orbit coupling, and methodologies to control its spin properties. Consequently, we have newly discovered weak topological insulator phase and Weyl magnet, and established a sophisticated way to determine topological phase diagram experimentally. Moreover, by a combination of spin-resolved ARPES with polarization-variable laser, we have opened a pathway to optically control electron’s spin through the spin-orbit entanglement in solid states .

Academic Significance and Societal Importance of the Research Achievements

本研究は ARPES や スピン分解 ARPES 測定の光源をレーザーや放射光、そして励起光をうまく選択する事でトポロジカル相図の決定、さらには光スピン制御の実証まで行ったものであり、バンド分散の形状やスピン偏極度の大きさを語るだけに留まった従来の測定に比べて一線を画す。スピン分解 ARPES においては、光スピン制御の微視的機構としてスピン干渉の直接観測に成功した。この結果は、物性研究の実験ツールとしてARPES 法の新しい利用価値を示したものである。本研究で解明したスピン干渉効果を利用して、光でスピンを制御するスピントロニクス、「光スピントロニクス」の可能性を提案できたと考えている。

Research Products

• [Int'l Joint Research] Weizmann Institute of Science(イスラエル)
• [Int'l Joint Research] Diamond Light Source(英国)
• [Int'l Joint Research] Elettra - Sincrotrone Trieste(イタリア)
• [Journal Article] A weak topological insulator state in quasi-one-dimensional bismuth iodide (2019)
  • Author(s): Ryo Noguchi, T. Takahashi, K. Kuroda, M. Ochi, T. Shirasawa, M. Sakano, C. Bareille, M. Nakayama, M. D. Watson, K. Yaji, A. Harasawa, H. Iwasawa, P. Dudin, T. K. Kim, M. Hoesch, V. Kandyba, A. Giampietri, A. Barinov, S. Shin, R. Arita, T. Sasagawa & Takeshi Kondo
  • Journal Title: Nature Volume: 566 Issue: 7745 Pages: 518-522
  • DOI: 10.1038/s41586-019-0927-7
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Low-energy electron-mode couplings in the surface bands of Sr2RuO4 revealed by laser-based angle-resolved photoemission spectroscopy (2019)
  • Author(s): Akebi Shuntaro、Kondo Takeshi、Nakayama Mitsuhiro、Kuroda Kenta、Kunisada So、Taniguchi Haruka、Maeno Yoshiteru、Shin Shik
  • Journal Title: Physical Review B Volume: 99 Issue: 8
  • DOI: 10.1103/physrevb.99.081108
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Coexistence of two types of spin splitting originating from different symmetries (2019)
  • Author(s): Koichiro Yaji, Anton Visikovskiy, Takushi Iimori, Kenta Kuroda, Singo Hayashi, Takashi Kajiwara, Satoru Tanaka, Fumio Komori and Shik Shin
  • Journal Title: Physical Review Letters Volume: 122 Issue: 12 Pages: 126403-126403
  • DOI: 10.1103/physrevlett.122.126403
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Monolithic LiF or MgF2 Lens-Window-Prism device for coherent 10.7 eV beam source with 1 MHz repetition rate (2019)
  • Author(s): Zhao Zhigang、Kuroda Kenta、Harasawa Ayumi、Kondo Takeshi、Shin Shik、Kobayashi Yohei
  • Journal Title: Chinese Optics Letters Volume: 17 Pages: 1-5
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Rashba spin splitting of L-gap surface states on Ag(111) and Cu(111) (2018)
  • Author(s): Yaji Koichiro、Harasawa Ayumi、Kuroda Kenta、Li Ronghan、Yan Binghai、Komori Fumio、Shin Shik
  • Journal Title: Physical Review B Volume: 98 Issue: 4
  • DOI: 10.1103/physrevb.98.041404
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser (2018)
  • Author(s): Kuroda Kenta、Yaji Koichiro、Harasawa Ayumi、Noguchi Ryo、Kondo Takeshi、Komori Fumio、Shin Shik
  • Journal Title: Journal of Visualized Experiments Volume: 136 Issue: 136
  • DOI: 10.3791/57090
  • Peer Reviewed
• [Journal Article] Kondo hybridization and quantum criticality in β?YbAlB4 by laser ARPES (2018)
  • Author(s): Bareille C?dric、Suzuki Shintaro、Nakayama Mitsuhiro、Kuroda Kenta、Nevidomskyy Andriy H.、Matsumoto Yosuke、Nakatsuji Satoru、Kondo Takeshi、Shin Shik
  • Journal Title: Physical Review B Volume: 97 Issue: 4
  • DOI: 10.1103/physrevb.97.045112
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Orbital-selective metal-insulator transition lifting the t2g band hybridization in the Hund metal Sr3(Ru1-xMnx)2O7 (2018)
  • Author(s): Nakayama M.、Kondo Takeshi、Kuroda K.、Bareille C.、Watson M. D.、Kunisada S.、Noguchi R.、Kim T. K.、Hoesch M.、Yoshida Y.、Shin S.
  • Journal Title: Physical Review B Volume: 98 Issue: 16
  • DOI: 10.1103/physrevb.98.161102
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Multiple topological states in iron-based superconductors (2018)
  • Author(s): P.Zhang, Z. Wang, X. Wu, K. Yaji, Y. Ishida, Y. Kohama, G. Dai, Y. Sun, C. Bareille1, K. Kuroda, T. Kondo1, K. Okazaki, K. Kindo1, X. Wang, C. Jin, J. Hu, R. Thomale, K. Sumida, S. Wu, K. Miyamoto, T. Okuda, H. Ding, G. D. Gu, T. Tamegai, T. Kawakami, M. Sato, S. Shin
  • Journal Title: Nature Physics Volume: 15 Issue: 1 Pages: 41-47
  • DOI: 10.1038/s41567-018-0280-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Experimental Determination of the Topological Phase Diagram in Cerium Monopnictides (2018)
  • Author(s): Kuroda Kenta、Ochi M.、Suzuki H.?S.、Hirayama M.、Nakayama M.、Noguchi R.、Bareille C.、Akebi S.、Kunisada S.、Muro T.、Watson M.?D.、Kitazawa H.、Haga Y.、Kim T.?K.、Hoesch M.、Shin S.、Arita R.、Kondo Takeshi
  • Journal Title: Physical Review Letters Volume: 120 Issue: 8 Pages: 1-6
  • DOI: 10.1103/physrevlett.120.086402
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evidence for magnetic Weyl fermions in a correlated metal (2017)
  • Author(s): Kuroda K.、Tomita T.、Suzuki M.-T.、Bareille C.、Nugroho A. A.、Goswami P.、Ochi M.、Ikhlas M.、Nakayama M.、Akebi S.、Noguchi R.、Ishii R.、Inami N.、Ono K.、Kumigashira H.、Varykhalov A.、Muro T.、Koretsune T.、Arita R.、Shin S.、Kondo Takeshi、Nakatsuji S.
  • Journal Title: Nature Materials Volume: 16 Issue: 11 Pages: 1090-1095
  • DOI: 10.1038/nmat4987
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spin-dependent quantum interference in photoemission process from spin-orbit coupled states (2017)
  • Author(s): Koichiro Yaji, Kenta Kuroda, Sogen Toyohisa, Ayumi Harasawa, Yukiaki Ishida, Shuntaro Watanabe, Chuangtian Chen, Katsuyoshi Kobayashi, Fumio Komori and Shik Shin
  • Journal Title: Nat. Commun. Volume: 8 Issue: 1 Pages: 14588-14588
  • DOI: 10.1038/ncomms14588
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Direct mapping of spin and orbital entangled wave functions under interband spin-orbit coupling of giant Rashba spin-split surface states (2017)
  • Author(s): Ryo Noguchi, Kenta Kuroda, K. Yaji, K. Kobayashi, M. Sakano, A. Harasawa, Takeshi Kondo, F. Komori, S. Shin
  • Journal Title: Physical Review B Volume: 95 Issue: 4 Pages: 1-5
  • DOI: 10.1103/physrevb.95.041111
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Ultrafast Surface Transport Measurement of the Topological Surface State in Sb₂Te₃ by Using Time-Resolved Two-Photon Photoemission with Mid-Infrared Laser Pulses (2017)
  • Author(s): 黒田 健太
  • Journal Title: Hyomen Kagaku Volume: 38 Issue: 8 Pages: 400-405
  • DOI: 10.1380/jsssj.38.400
  • NAID: 130005997152
  • ISSN: 0388-5321, 1881-4743
  • Peer Reviewed
• [Journal Article] 矢治光 一郎, 黒田 健太, 小森 文夫, 辛 埴 (2017)
  • Author(s): 固体表面電子におけるスピン軌道エンタングルメントと光スピン制御
  • Journal Title: 固体物理 Volume: 52 Pages: 559-571
• [Presentation] 真空紫外および軟X線領域の放射光角度分解光電子分光を用いた新しいトポロジカル物質相の研究 (2019)
  • Author(s): 黒田健太
  • Organizer: 第32回日本放射光学会年会放射光科学合同シンポジウム
  • Invited
• [Presentation] CeSbにおける悪魔の階段的な反強磁性構造転移に伴うバンド構造の変調 (2019)
  • Author(s): 黒田健太, Nafise Rezaei, 鈴木博之, 芳賀芳範, 新井陽介, 国定聡, 櫻木俊輔, Mojtaba Alaei, Cedric Bareille, 野口亮, 明比俊太朗, 北澤英明, 岡崎浩三, 木下雄斗, 徳永将史, 辛埴, 有田亮太郎, 近藤猛
  • Organizer: 日本物理学会 第74回年次大会（2019年）
• [Presentation] レーザー角度分解光電子分光で観測するCeSbの電子格子結合 (2019)
  • Author(s): 新井陽介, 黒田健太, 岩佐和晃, N. Rezaei, 鈴木博之, 芳賀芳範, 国定聡, 櫻木俊輔, 明比俊太朗, M. Alaei, 北澤英明, 辛埴, 有田亮太郎, 近藤猛
  • Organizer: 日本物理学会 第74回年次大会（2019年）
• [Presentation] 高分解能 ARPES で調べる悪魔の階段を示す反強磁性体 CeSb (2018)
  • Author(s): 黒田健太, Nafise Rezaei, 鈴木博之, 芳賀芳範, 国定聡, Mojtaba Alaei, Cedric Bareille, 野口亮, 中山充大, 坂野昌人, 明比俊太郎, 大田由一, 橋本嵩広, 都築章宏, 岡崎浩三, 有田将司, 出田真一郎, 田中清尚, 徳永将史, 北澤英明, 辛埴, 有田亮太郎, 近藤猛
  • Organizer: 日本物理学会 2018年秋季大会
• [Presentation] 高次高調波を用いた時間・スピン・角度分解光電子分光の装置開発 (2018)
  • Author(s): 黒田健太, 原沢あゆみ, Zhigang Zhao, 矢治光一郎, 藤澤正美, 櫻木俊輔, 野口亮, 近藤猛, 小森文夫, 小林洋平, 辛埴
  • Organizer: 日本物理学会 2018年秋季大会
• [Presentation] A magnetic Weyl fermion state in non-collinear antiferromagnet Mn3Sn (2018)
  • Author(s): Kenta Kuroda, T. Tomita, M. T. Suzuki, C. Bareille, A. A. Nugroho, P. Goswami, M. Ochi, M. Ikhlas, M. Nakayama, S. Akebi, R. Noguchi, N. Inami, K. Ono, H. Kumigashira, A. Varykhalov, T. Muro, T. Koretsune, R. Arita, S. Shin, T. Kondo, S. Nakatsuji
  • Organizer: International Workshop on Trends in Advanced Spectroscopy in Materials Science
  • Int'l Joint Research
• [Presentation] Experimental Determination of the Topological Phase Diagram in Cerium Monopnictides (2018)
  • Author(s): Kenta Kuroda, M. Ochi, H. S. Suzuki, M. Hirayama, M. Nakayama, R. Noguchi, C. Bareille, S. Akebi, S. Kunisada, T. Muro, M. D. Watson, H. Kitazawa, Y. Haga, T. K. Kim, M. Hoesch, S. Shin, R. Arita, T. Kondo
  • Organizer: International Workshop on Trends in Advanced Spectroscopy in Materials Science
  • Int'l Joint Research
• [Presentation] 光電子分光を用 いたトポロジカル絶縁体におけるスピン偏 極表面電子とその光制御の研究 (2018)
  • Author(s): 黒田健太
  • Organizer: 日本物理学会第73回年次大会
  • Invited
• [Presentation] レーザー光電子分光で観測する弱いトポロジカル絶縁体β-Bi4I4の側面表面状態 (2018)
  • Author(s): 野口亮, 高橋敬成, 黒田健太, 越智正之, 白澤徹郎, C. Bareille, 坂野昌人, 中山充大, 矢治光一郎, 原沢あゆみ, 岩澤英明, M. Watson, P. Dudin, T. Kim, M. Hoesch, 辛埴, 有田亮太郎, 笹川崇男, 近藤猛
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Optical Control over Spin-Polarized Surface States in Topological Insulators (2017)
  • Author(s): Kenta Kuroda
  • Organizer: Ultrafast Surface Dynamics 10
  • Int'l Joint Research / Invited
• [Presentation] Optical Control over Spin-Polarized Surface States in Topological Insulators (2017)
  • Author(s): Kenta Kuroda
  • Organizer: THE AVS 64th INTERNATIONAL SYMPOSIUM & EXHIBITION 2017
  • Int'l Joint Research / Invited
• [Presentation] Optical Control over Spin-Polarized Surface States in Topological Insulators (2017)
  • Author(s): Kenta Kuroda, Johannes Reimann, Jens Guedde, Ulrich Hoefer
  • Organizer: International workshop on strong correlations and angle-resolved photoemission spectroscopy
  • Int'l Joint Research
• [Remarks] 『弱い』トポロジカル絶縁体の世界初の実証に成功（プレスリリース）
  • URL: http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=7464
• [Remarks] 第23回日本放射光学会奨励賞
  • URL: http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=7626
• [Remarks] グラフェンで保護されたスズ単原子膜（プレスリリース）
  • URL: http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=7818
• [Remarks] 「ワイル磁性体」を世界で初めて発見 ーワイル粒子で駆動する次世代量子デバイス実現へ道筋ー
  • URL: http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=2515
• [Remarks] 物質の内部に隠れたトポロジーの直接観測に成功 ～「物質のトポロジー」は見かけより中身が大事～
  • URL: http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=4479