Time- and angle-resolved photoemission study of high-Tc cuprates

• Project/Area Number: 23740256
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• 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): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: 超高速現象 / 高温超伝導体 / 光電子分光 / 超短パルスレーザー / トポロジカル絶 縁体 / 表面光電効果 / 非線形光学過程 / トポロジカル絶縁体 / 強相関電子系

Research Abstract

A high-Tc copper-oxide superconductor is investigated by means of time- and angle-resolved photoemission spectroscopy. We observe that the transient changes in the spectra occur only below a characteristic kink binding energy, and that the superconducting gap is transiently filled in the momentum region near the gap node. The results indicate that the scattering rate between the quasiparticle-excitations and the boson mode relevant for the kink is transiently increased so that the spectral weight is redistributed near the node and fills the superconducting gap in the nodal region. We also find a phenomenon wherein the efficiency of photoemission is modified when the surface is driven into non-equilibrium. This observation provides insights into the mechanism of photoemission from surface.

Research Products

• [Journal Article] Access to hole dynamics in graphite by femtosecond luminescence and photoemission spectroscopy (2013)
  • Author(s): Tohru Suemoto, Shigeyuki Sakaki, Makoto Nakajima, Yukiaki Ishida, and Shik Shin
  • Journal Title: Phys. Rev. B Volume: 87 Issue: 22 Pages: 224302-224302
  • DOI: 10.1103/physrevb.87.224302
  • Peer Reviewed
• [Journal Article] Anomalous Doping Variation of the Nodal Low-Energy Feature of Superconducting (Bi,Pb)_2(Sr,La)_2 CuO_6+d Crystals Revealed by Laser-Based Angle Resolved Photoemission Spectroscopy (2013)
  • Author(s): T. Kondo, Y. Nakashima, W.Malaeb, Y. Ishida, Y. Hamaya, T. Takeuchi,S. Shin
  • Journal Title: Physical Review Letters Volume: 110 Pages: 217006-217006
  • Peer Reviewed
• [Journal Article] Anomalous Dressing of Dirac Fermions in the Topological Surface State of Bi_2Se_3, Bi_2Te_3, and Cu-Doped Bi_2Se_3 (2013)
  • Author(s): T. Kondo, Y. Nakashima, Y. Ota,Y. Ishida, W. Malaeb, K.Okazaki,S.Shin
  • Journal Title: Physical Review Letters Volume: 110 Issue: 21 Pages: 217601-217601
  • DOI: 10.1103/physrevlett.110.217601
  • Peer Reviewed
• [Journal Article] Non-thermal hot electrons ultrafastly generating hot optical phonons in graphite (2011)
  • Author(s): Y. Ishida, T. Togashi, K. Yamamoto, M. Tanaka, T. Taniuchi, T.Kiss, M. Nakajima, T. Suemoto, S. Shin
  • Journal Title: Scientific Reports Volume: 1 Pages: 64-64
  • Peer Reviewed
• [Journal Article] Non-thermal hot electrons ultrafastly generating hot optical phonons in graphite (2011)
  • Author(s): Y.Ishida, T.Togashi, K.Yamamoto, M.Tanaka, T.Taniuchi, T.Kiss, M.Nakajima, T.Suemoto, S.Shin
  • Journal Title: Sci.Rep. Volume: 1 Issue: 1 Pages: 64-64
  • DOI: 10.1038/srep00064
  • Peer Reviewed
• [Presentation] Transient Surface Photoemission Involving Nonlinear Surface Sheet Polarization Developed on the Doped Bi_2Se_3 Topological Insulator (2013)
  • Author(s): Y. Ishida,H. Kanto, W. Malaeb, S. Watanabe, C.-T.Chen, A. Kikkawa, Y. Taguchi, Y. Tokura,S. Shin
  • Organizer: APS March Meeting 2013
  • Place of Presentation: Baltimore Convention Center,Maryland, USA.
• [Presentation] Transient Surface Photoemission Involving Nonlinear Surface Sheet Polarization Developed on the Doped Bi2Se3 Topological Insulator (2013)
  • Author(s): Yukiaki Ishida
  • Organizer: APS March Meeting 2013
  • Place of Presentation: Baltimore Convention Center, Maryland, USA
• [Presentation] ドープしたBi_2Se_3の表面分極を介した超高速非線形光電子放出 (2012)
  • Author(s): 石田行章, 菅藤裕昭 , Walid Malaeb, 渡部俊太郎 , Chuangtian Chen, 吉川明子, 田口康二郎, 十倉好紀, 辛埴
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-18
• [Presentation] Time-resolved ARPES of graphite using deep-to-extreme UV lasers (2012)
  • Author(s): Y. Ishida
  • Organizer: JAEA Symposium on Synchrotron Radiation Research
  • Place of Presentation: 兵庫県
  • Year and Date: 2012-03-07
• [Presentation] ドープしたBi2Se3の表面分極を介した超高速非線形光電子放出 (2012)
  • Author(s): 石田行章
  • Organizer: 日本物理学会「秋季大会」
  • Place of Presentation: 横浜国立大学
• [Presentation] Time-resolved ARPES of graphite using deep-to-extreme UV lasers (2012)
  • Author(s): Y. Ishida
  • Organizer: JAEA Symposium on Synchrotron Radiation Research(招待講演)
  • Place of Presentation: 兵庫県