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Direct observation of strong momentum-dependent electron-phonon coupling in a metal

Journal Article · · Science Advances
 [1];  [2];  [3];  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [5];  [4];  [6];  [4];  [4];  [7]
  1. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.; SLAC National Accelerator Laboratory
  2. Laboratory of Physics of Ionic Crystals, Institute of Physics, University of Tartu, W. Ostwaldi tn 1, Tartu, 50411, Estonia.; Quantum Simulations Group, Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
  3. Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, S-75120, Sweden.
  4. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
  5. Department of Physics and Astronomy, Università degli Studi di Padova,Padova, 8-35131, Italy.
  6. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.; Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  7. Quantum Simulations Group, Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
+ Show Author Affiliations
Phonon scattering in metals is one of the most fundamental processes in materials science. However, understanding such processes has remained challenging and requires detailed information on interactions between phonons and electrons. We use an ultrafast electron diffuse scattering technique to resolve the nonequilibrium phonon dynamics in femtosecond–laser-excited tungsten in both time and momentum. We determine transient populations of phonon modes which show strong momentum dependence initiated by electron-phonon coupling. For phonons near Brillouin zone border, we observe a transient rise in their population on a timescale of approximately 1 picosecond driven by the strong electron-phonon coupling, followed by a slow decay on a timescale of approximately 8 picosecond governed by the weaker phonon-phonon relaxation process. We find that the exceptional harmonicity of tungsten is needed for isolating the two processes, resulting in long-lived nonequilibrium phonons in a pure metal. Our finding highlights that electron-phonon scattering can be the determinant factor in the phonon thermal transport of metals.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
89233218CNA000001; AC02-76SF00515; AC52-07NA27344
OSTI ID:
2293599
Alternate ID(s):
OSTI ID: 2406148
Report Number(s):
LLNL-JRNL-851805
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 11 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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