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Switching of the electron-phonon interaction in 1T−VSe2 assisted by hot carriers

Paulina Majchrzak1,2, Sahar Pakdel1, Deepnarayan Biswas1, Alfred J. H. Jones1, Klara Volckaert1, Igor Marković3,4, Federico Andreatta1, Raman Sankar5, Chris Jozwiak6 et al.

Eli Rotenberg6, Aaron Bostwick6, Charlotte E. Sanders2, Yu Zhang2, Gabriel Karras2, Richard T. Chapman2, Adam Wyatt2, Emma Springate2, Jill A. Miwa1, Philip Hofmann1, Phil D. C. King3, Nicola Lanatà1,7, Young Jun Chang8,9, and Søren Ulstrup1,*

  • 1Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark
  • 2Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell 0X11 0QX, United Kingdom
  • 3SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
  • 4Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
  • 5Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, Republic of China
  • 6Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 7Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, 10691 Stockholm, Sweden
  • 8Department of Physics, University of Seoul, Seoul 02504, Republic of Korea
  • 9Department of Smart Cities, University of Seoul, Seoul, 02504, Republic of Korea

  • *Corresponding author: ulstrup@phys.au.dk
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Phys. Rev. B 103, L241108 – Published 16 June, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L241108

Abstract

We apply an intense infrared laser pulse in order to perturb the electronic and vibrational states in the three-dimensional charge density wave material 1T−VSe2. Ultrafast snapshots of the light-induced hot carrier dynamics and nonequilibrium quasiparticle spectral function are collected using time- and angle-resolved photoemission spectroscopy. The hot carrier temperature and time-dependent electronic self-energy are extracted from the time-dependent spectral function, revealing that incoherent electron-phonon interactions heat the lattice above the charge density wave critical temperature on a timescale of (200±40) fs. Density functional perturbation theory calculations establish that the presence of hot carriers alters the overall phonon dispersion and quenches efficient low-energy acoustic phonon scattering channels, which results in a new quasiequilibrium state that is experimentally observed.

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Phys. Rev. B 103, L241108– Published 16 June, 2021
  • Received 12 November 2020
  • Revised 4 March 2021
  • Accepted 3 June 2021
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