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Concurrent probing of electron-lattice dephasing induced by photoexcitation in 1T-TaSeTe using ultrafast electron diffraction

Jun Li, Junjie Li, Kai Sun, Lijun Wu, Renkai Li, Jie Yang, Xiaozhe Shen, Xijie Wang, Huixia Luo, Robert J. Cava, Ian K. Robinson, Xilian Jin, Weiguo Yin, Yimei Zhu, and Jing Tao
Phys. Rev. B 101, 100304(R) – Published 31 March 2020
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Abstract

It has been technically challenging to concurrently probe the electrons and the lattices in materials during nonequilibrium processes, allowing their correlations to be determined. Here, in a single set of ultrafast electron diffraction patterns taken on the charge-density-wave (CDW) material 1T-TaSeTe, we discover a temporal shift in the diffraction intensity measurements as a function of scattering angle. With the help of dynamic models and theoretical calculations, we show that the ultrafast electrons probe both the valence-electron and lattice dynamic processes, resulting in the temporal shift measurements. Our results demonstrate unambiguously that the CDW is not merely a result of the periodic lattice deformation ever present in 1T-TaSeTe but has significant electronic origin. This method demonstrates an approach for studying many quantum effects that arise from electron-lattice dephasing in molecules and crystals for next-generation devices.

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  • Received 26 March 2019
  • Revised 14 February 2020
  • Accepted 20 February 2020

DOI:https://doi.org/10.1103/PhysRevB.101.100304

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jun Li1, Junjie Li1, Kai Sun2, Lijun Wu1, Renkai Li3, Jie Yang3, Xiaozhe Shen3, Xijie Wang3, Huixia Luo4, Robert J. Cava4, Ian K. Robinson1,5, Xilian Jin1,6, Weiguo Yin1, Yimei Zhu1, and Jing Tao1,*

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 3SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 4Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
  • 5London Centre for Nanotechnology, University College, London WC1E 6BT, United Kingdom
  • 6College of Physics, Jilin University, Changchun, Jilin 130012, People's Republic of China

  • *jtao@bnl.gov

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Issue

Vol. 101, Iss. 10 — 1 March 2020

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