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Detecting electron-phonon coupling during photoinduced phase transition

Takeshi Suzuki1,*, Yasushi Shinohara2,3, Yangfan Lu4, Mari Watanabe1, Jiadi Xu1, Kenichi L. Ishikawa2,3,5, Hide Takagi4,6, Minoru Nohara7, Naoyuki Katayama8 et al.

Hiroshi Sawa8, Masami Fujisawa1, Teruto Kanai1, Jiro Itatani1, Takashi Mizokawa9, Shik Shin1,10,11,12,†, and Kozo Okazaki1,10,12,13,‡

  • 1Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2Photon Science Center, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 3Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 4Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
  • 5Research Institute for Photon Science and Laser Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 6Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • 7Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
  • 8Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
  • 9School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan
  • 10AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERAND-OIL), Kashiwa, Chiba 277-8581, Japan
  • 11Office of University Professor, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 12Material Innovation Research Center, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 13Trans-scale Quantum Science Institute, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

  • *Corresponding author: takeshi.suzuki@issp.u-tokyo.ac.jp
  • †Corresponding author: shin@issp.u-tokyo.ac.jp
  • ‡Corresponding author: okazaki@issp.u-tokyo.ac.jp
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Phys. Rev. B 103, L121105 – Published 10 March, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L121105

Abstract

Photoinduced phase transitions have been intensively studied owing to the potential capability to control a material of interest in the ultrafast manner, which can induce exotic phases unable to be attained at equilibrium. However, the key mechanisms are still under debate, and it is currently a central issue as to how the couplings between the electron, lattice, and spin degrees of freedom are evolving during photoinduced phase transitions. Here, we use a recently developed analysis method, which we call frequency-domain angle-resolved photoemission spectroscopy (FDARPES), and reveal mode- and band-selective electron-phonon couplings during the photoinduced insulator-to-metal transition for Ta2NiSe5. We find that the lattice modulation corresponding to the 2 THz phonon mode, where the Ta lattice is sheared along the a axis, is the most relevant for the emergence of photoinduced semimetallic state. Furthermore, we find that the semimetallic and semiconducting bands coexist in the transient state, and demonstrate that FDARPES spectra can selectively detect the phonon-specific couplings to the two coexistent band structures during the photoinduced phase transition by resolving them in the frequency domain.

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Phys. Rev. B 103, L121105– Published 10 March, 2021
  • Received 22 July 2020
  • Revised 4 February 2021
  • Accepted 19 February 2021
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