Nonequilibrated state of matter investigated via time-resolved photoemission

• Project/Area Number: 26800165
• 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: Ishida Yukiaki 東京大学, 物性研究所, 助教 (30442924)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 時間分解光電子分光法 / トポロジカル絶縁体 / 光起電力 / スピン偏極電流 / 銅酸化物高温超伝導体 / ディラック電子系 / 超高速現象 / トポロジカル系物質 / スピントロニクス / 光電子分光 / 時間分解 / ワイル半金属 / 時間分解光電子分光 / 近藤半導体 / 表面光起電力

Outline of Final Research Achievements

A continuous development was pursued for a variety of pump-probe photoemission spectroscopic method and methodologies: (1) By revealing the band structures in the unoccupied side, a variety of topological states of matter (topological insulators, TIs, and Weyl semimetals) was identified. (2) Owing to the surface sensitivity of the method, we discovered the emergence of surface photovoltage on a series of bulk-insulating TIs, by which optical generation of spin-polarized surface current may become possible. (3) A new mechanism was proposed for the cuprate superconductivity after investigating the ultrafast responses of the electronic structures of Bi2212. 4. Ultrafast carrier dynamics of Dirac electrons were investigated, and the applicability of some models as well as the realization of an inverted population were discussed.

Research Products

• [Int'l Joint Research] Chinese achademy of Sciences(中国)
• [Int'l Joint Research] Princeton University/Rice University/LANL(米国)
• [Int'l Joint Research] プリンストン大学/ロスアラモス研究所/セントラルフロリダ大学(米国)
• [Int'l Joint Research] 南京大学/国立清華大学/国立中山大学(中国)
• [Int'l Joint Research] Nanyang technological institute(シンガポール)
• [Int'l Joint Research] Soleil(フランス)
• [Journal Article] Topologically Entangled Rashba-Split Shockley States on the Surface of Grey Arsenic (2017)
  • Author(s): P. Zhang,* J.-Z. Ma,* Y. Ishida,* L.-X. Zhao,* Q.-N. Xu, B.-Q. Lv, K. Yaji, G.-F. Chen, H.-M. Weng, X. Dai, Z. Fang, X.-Q. Chen, L. Fu, T. Qian, H. Ding, S. Shin
  • Journal Title: Physical Review Letters Volume: 118 Issue: 4 Pages: 046802-046802
  • DOI: 10.1103/physrevlett.118.046802
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mo x W 1-x Te 2 (2016)
  • Author(s): I.Belopolski, S.Y.Xu, Y.Ishida, X.Pan, P.Yu, D.S.Sanchez, H.Zheng, M.Neupane, N. Alidoust, G.Chang,T.R.Chang, Y.Wu,G.Bian, S.M.Huang, C.C.Lee, D.Mou, L.Huang, Y. Song, B.Wang, G.Wang, Y.W.Yeh, N.Yao, J.E.Rault, P.L.F`evre, F.Bertran, H.T.Jeng, T. Kondo, A.Kaminski, H.Lin, Z.Liu, F.Song, S.Shin, M.Z.Hasan
  • Journal Title: Physical Review B Volume: 94 Issue: 8 Pages: 085127-085127
  • DOI: 10.1103/physrevb.94.085127
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High repetition pump-and-probe photoemission spectroscopy based on a compact fiber laser system (2016)
  • Author(s): Y. Ishida, T. Otsu, A. Ozawa, K. Yaji, S. Tani, S. Shin, Y. Kobayashi
  • Journal Title: Review of Scientific Instrumnets Volume: 87 Issue: 12 Pages: 123902-123902
  • DOI: 10.1063/1.4969053
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Ultrafast Time-Resolved Photoemission Spectroscopy (2016)
  • Author(s): 石田行章
  • Journal Title: Hyomen Kagaku Volume: 37 Issue: 1 Pages: 31-36
  • DOI: 10.1380/jsssj.37.31
  • NAID: 130005121619
  • ISSN: 0388-5321, 1881-4743
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Discovery of a new type of topological Weyl fermion semimetal state in MoxW1xTe2 (2016)
  • Author(s): I. Belopolski,* D. S. Sanchez,* Y. Ishida,* X. Pan,* P. Yu,* S.-Y. Xu, G. Chang, T.-R. Chang, H. Zheng, N. Alidoust, G. Bian, M. Neupane, S.-M. Huang, C.-C. Lee, Y. Song, H. Bu, G. Wang, S. Li, G. Eda, H.-T. Jeng, T. Kondo, H. Lin, Z. Liu, F. Song, S. Shin, M. Z. Hasan
  • Journal Title: Nature Communications Volume: 7 Issue: 1 Pages: 13643-13643
  • DOI: 10.1038/ncomms13643
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal (2016)
  • Author(s): Y. Ishida, H. Masuda, H. Sakai, S. Ishiwata, and S. Shin
  • Journal Title: Physical Review B (Rapid Communication) Volume: 93 Issue: 10
  • DOI: 10.1103/physrevb.93.100302
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Electronic structure and relaxation dynamics in a superconducting topological material (2016)
  • Author(s): M. Neupane, Y. Ishida, R. Sankar, J.-X. Zhu, D. S. Sanchez, I. Belopolski, S.-Y. Xu, N. Alidoust, M. M. Hosen, S. Shin, F. C. Chou, M. Z. Hasan, T. Durakiewicz
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 22557-22557
  • DOI: 10.1038/srep22557
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Quasi-particles ultrafastly releasing kink bosons to form Fermi arcs in a cuprate superconductor (2016)
  • Author(s): Y. Ishida, T. Saitoh, T. Mochiku, T. Nakane, K. Hirata, S. Shin
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 18747-18747
  • DOI: 10.1038/srep18747
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Hybridization gap formation in Kondo insulator YB12 obesrved using time-resolved photoemission spectroscopy (2015)
  • Author(s): M. Okawa, Y. Ishida, M. Takahashi, T. Shimada, F. Iga, T. Takabatake, T. Saitoh, and S. Shin
  • Journal Title: Phys. Rev. B Volume: 92 Issue: 16
  • DOI: 10.1103/physrevb.92.161108
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Gigantic surface lifetime of an intrinsic topological insulator (2015)
  • Author(s): M. Neupane*, S.-Y. Xu*, Y. Ishida*, S. Jia, B.M. Fregoso, C. Liu, I. Belopolski, G. Bian, N. Alidoust, T. Durakiewicz, V. Galitski, S. Shin, R.J. Cava, M.Z. Hasan (*equal contribution)
  • Journal Title: Physical Review Letters Volume: 115 Issue: 11 Pages: 116801-116801
  • DOI: 10.1103/physrevlett.115.116801
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3 (2015)
  • Author(s): S. Zhu, Y. Ishida, K. Kuroda, K. Sumida, M. Ye, J. Wang, H. Pan, M. Taniguchi, S. Qiao, S. Shin, A. Kimura
  • Journal Title: Scientific Reports Volume: 5 Issue: 1 Pages: 13213-13213
  • DOI: 10.1038/srep13213
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy (2015)
  • Author(s): Y. Ishida, T. Otsu, T. Shimada, M. Okawa, Y. Kobayashi, F. Iga, T. Takabatake, S. Shin
  • Journal Title: Scientific Reports Volume: 5 Issue: 1 Pages: 8160-8160
  • DOI: 10.1038/srep08160
  • Peer Reviewed / Open Access
• [Journal Article] Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability (2014)
  • Author(s): Y. Ishida, T. Togashi, K. Yamamoto, M. Tanaka, T. Kiss, T. Otsu, Y. Kobayashi, S. Shin
  • Journal Title: Review of Scientific Instruments Volume: 85 Issue: 12 Pages: 123904-123904
  • DOI: 10.1063/1.4903788
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Non-equilibrated electronic structures and dynamics of Dirac and topological materials (2017)
  • Author(s): Y. Ishida
  • Organizer: Nanoscale Spectroscopy and Nanotechnology 9
  • Place of Presentation: Gyeongju, South Korea
  • Year and Date: 2017-09-25
  • Int'l Joint Research / Invited
• [Presentation] Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal (2017)
  • Author(s): Yukiaki Ishida, Hidetoshi Masuda, Hideaki Sakai, Shintaro Ishiwata, Shik Shin
  • Organizer: APS March Meeting
  • Place of Presentation: 米国、ニューオリンズ
  • Year and Date: 2017-03-13
  • Int'l Joint Research
• [Presentation] Time-resolved photoemission spectroscopy implemented by femtosecond lasers (2016)
  • Author(s): Y. Ishida
  • Organizer: EMN Meeting on Ultrafast
  • Place of Presentation: オーストラリア、メルボルン
  • Year and Date: 2016-10-10
  • Int'l Joint Research / Invited
• [Presentation] カーボンナノチューブの時間分解光電子分光 (2016)
  • Author(s): 石田行章、Gao Weilu、矢治光一郎、原沢あゆみ、河野淳一郎、辛埴
  • Organizer: 日本物理学会 秋季大会
  • Place of Presentation: 金沢大学、石川県金沢市
  • Year and Date: 2016-09-13
• [Presentation] Time-resolved photoemission spectroscopy implemented by femtosecond laser sources (2016)
  • Author(s): Yukiaki Ishida
  • Organizer: Interacting quantum systems driven out of equilibrium
  • Place of Presentation: 米国 テキサス州 ヒューストン、ライス大学
  • Year and Date: 2016-05-05
  • Int'l Joint Research
• [Presentation] 多層ディラック電子系SrMnBi2の時間分解ARPES (2016)
  • Author(s): 石田行章、増田英俊 、酒井英明、石渡晋太郎、辛埴
  • Organizer: 第７１回日本物理学会年次大会
  • Place of Presentation: 宮城県仙台市、東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] Quasi-particles ultrafastly releasing kink bosons to form Fermi arcs in a cuprate superconductor (2016)
  • Author(s): Y. Ishida, T. Saitoh, S. Shin, T. Mochiku, T. Nakane, K. Hirata
  • Organizer: APS March Meeting 2016
  • Place of Presentation: 米国 メリーランド州 ボルチモア
  • Year and Date: 2016-03-14
  • Int'l Joint Research
• [Presentation] 銅酸化物高温超伝導体の準粒子分散、超伝導ギャップ、およびフェルミアークの超高速応答 (2015)
  • Author(s): 石田行章、齋藤朋也、茂筑高士、中根茂行、平田和人、辛埴
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 大阪府吹田市、関西大
  • Year and Date: 2015-09-16
• [Presentation] 超高速時間分解光電子分光 (2015)
  • Author(s): 石田行章
  • Organizer: 表面科学会・第１回関東支部セミナー
  • Place of Presentation: 東京都文京区、東京大学
  • Year and Date: 2015-05-22
  • Invited
• [Presentation] SmB6 の時間分解光電子分光：バルクギャップ形成とともに表面に現れる光起電力 (2015)
  • Author(s): 石田行章、乙津聡夫、島田智子、大川万里生、小林洋平、伊賀文敏、高畠敏郎、辛埴
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy (2015)
  • Author(s): Y. Ishida, T. Otsu, T. Shimada, M. Okawa, Y. Kobayashi, F. Iga, T. Takabatake, S. Shin
  • Organizer: APS March Meeting
  • Place of Presentation: サンアントニオ(米国)
  • Year and Date: 2015-03-02 – 2015-03-06