Electron-Phonon Coupling Investigated by Fourier-Transform Time-Resolved ARPES
Project/Area Number |
19H01818
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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Research Institution | The University of Tokyo |
Principal Investigator |
Okazaki Kozo 東京大学, 物性研究所, 准教授 (40372528)
|
Co-Investigator(Kenkyū-buntansha) |
鈴木 剛 東京大学, 物性研究所, 助教 (30815915)
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Project Period (FY) |
2019-04-01 – 2022-03-31
|
Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥14,040,000 (Direct Cost: ¥10,800,000、Indirect Cost: ¥3,240,000)
|
Keywords | 時間分解光電子分光 / 光誘起相転移 / コヒーレントフォノン / 非平衡電子状態 / 励起子絶縁体 / 電荷密度波 / 時間分解ARPES / 電子-格子相互作用 / 遷移金属ダイカルコゲナイド / 超伝導 |
Outline of Research at the Start |
本研究課題の目的は、我々が独自に開発したフーリエ変換時間・角度分解光電子分光により、電子-格子相互作用が密接に関係している電荷密度波転移や超伝導転移を示す遷移金属ダイカルコゲナイド単結晶における、電子-格子相互作用の詳細を解明することにある。さらに、変位励起型コヒーレントフォノン励起機構を利用する事で、光誘起相転移を自在に制御することを試みる事にある。この目的達成のため、極紫外レーザー時間・角度分解光電子分光装置に光パラメトリック増幅器を導入して幅広い波長をポンプ光に使えるようにし、様々な遷移金属ダイカルコゲナイドについてフーリエ変換時間・角度分解光電子分光測定を行う。
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Outline of Final Research Achievements |
We have revealed nonequilibrium electronic states after photoexcitation by time- and angle-resolved photoemission spectroscopy, and especially, frequency domain angle-resolved photoemission spectroscopy (FDARPES), which maps oscillation of photoemission intensity induced by coherent phonon excitation to energy-momentum space, for various materials. For the materials which shows a photo-induced phase transition, coherent phonon excitations are often observed, and the detailed oscillations of the electronic structures accompanied with the photo-induced phase transition were successfully revealed by the FDARPES analysis.
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Academic Significance and Societal Importance of the Research Achievements |
コヒーレントフォノン励起を伴う光誘起相転移において、コヒーレントフォノンに同期して、金属状態と絶縁体状態が交互に現れるなど、新たに開発されたFDARPESという手法を用いて初めて得られる情報を抽出することに成功した。これは、光誘起相転移における詳細な電子構造の変化やそのメカニズムの理解について大きく進展させる成果である。この成果により、物質におけるバンド構造の制御、さらにそれに基づく物性制御、超高速スイッチングの実現など、将来的には一般社会への波及効果も期待できる。
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Report
(4 results)
Research Products
(83 results)
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[Presentation] Ultrafast Lattice Dynamics of BaFe2As2 Studied by XFEL2019
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[Presentation] Manifestation of the multiband nature in the BCS-BEC crossover of FeSe1-xSx2019
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[Presentation] Time-resolved ARPES study on Ta2NiSe52019
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Takeshi Suzuki, Yasushi Shinohara, Yangfan Lu, Mari Watanabe, Jiadi Xu, Hidenori Takagi, Minoru Nohara, Naoyuki Katayama, Hiroshi Sawa, Masami Fujisawa, Teruto Kanai, Nobuhisa Ishii, Jiro Itatani, Takashi Mizokawa, Kenichi L. Ishikawa, Kozo Okazaki, and Shik Shin
Organizer
International Conference on Ultrafast and Nonlinear Dynamics of Quantum Materials (Paris Ultrafast 2019)
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[Presentation] Time-resolved ARPES study on Ta2NiSe52019
Author(s)
T. Suzuki, Y. Shinohara, Y. F. Lu, M. Watanabe, J. Xu, H. Takagi, M. Nohara, N. Katayama, H. Sawa, M. Fujisawa, T. Kanai, N. Ishii, J. Itatani, T. Mizokawa, K. Okazaki, and S. Shin
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1st Annual ISSP & IBS-CCES Workshop
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[Presentation] Manifestation of the multiband nature in the BCS-BEC crossover of FeSe1-xSx2019
Author(s)
T. Hashimoto, Y. Ota, A. Tsuzuki, T. Nagashima, S. Kasahara, Y. Matsuda, K. Matsuura, Y. Mizukami, T. Shibauchi, K. Okazaki, S. Shin
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1st Annual ISSP & IBS-CCES Workshop
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[Presentation] 超高分解能レーザーARPESによるトポロジカル絶縁体(Bi1-xSbx)2Te3薄膜への超伝導近接効果2019
Author(s)
都築章宏, 橋本嵩広, 長島椿, 福島昭子, Joseph A. Hlevyack, Lin, Meng Kai, Peng Chen, Ro-Ya Liu, Yang Bai, James N. Eckstein, Tai Chang Chiang, 岡崎浩三, 辛埴
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日本物理学会第74回年次大会
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[Presentation] Sn1-xNaxSeの時間分解光電子分光2019
Author(s)
赤羽祐香, 前田瑞綺, 密岡拓心, G. Tan, L.-D. Zhao, M.G. Kanatzidis, 鈴木剛, 渡邉真莉, 藤澤正美, 金井輝人, 石井順久, 板谷治郎, 岡崎浩三, 辛埴, N.L. Saini, 溝川貴司
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日本物理学会第74回年次大会
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[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
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日本物理学会第74回年次大会
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[Presentation] 時間分解X線回折によるBaFe2As2における超高速格子変調ダイナミクスの観測2019
Author(s)
鈴木剛, 久保田雄也, 下志万貴博, 中村飛鳥, 田久保耕, 伊藤俊, 山本航平, 道前翔矢, 佐藤光, 平松秀典, 細野秀雄, 富樫格, 矢橋牧名, 和達大樹, 松田巌, 岡崎浩三, 辛埴
Organizer
日本物理学会第74回年次大会
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