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

Journal Article · · Physical Review B
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [4];  [5];  [5];  [5];  [6];  [6];  [6];  [6];  [6];  [6];  [2];  [2];  [7] more »;  [8];  [9];  [2] « less
  1. Aarhus Univ. (Denmark); STFC Rutherford Appleton Lab., Harwell (United Kingdom)
  2. Aarhus Univ. (Denmark)
  3. Univ. of St. Andrews (United Kingdom); Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  4. Academia Sinica, Taipei (Taiwan)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. STFC Rutherford Appleton Lab., Harwell (United Kingdom)
  7. Univ. of St. Andrews (United Kingdom)
  8. Aarhus Univ. (Denmark); KTH Royal Institute of Technology and Stockholm Univ. (Sweden)
  9. Univ. of Seoul (Korea)
+ Show Author Affiliations

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. Furthermore, 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1821878
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Charge order
Density functional theory
Dynamical phase transitions
Heat transfer
Peierls transition
Perturbation theory
Time & angle resolved photoemission spectroscopy
Transition-metal dichalcogenide