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Title: Ultrafast electron diffraction from non-equilibrium phonons in femtosecond laser heated Au films

We use ultrafast electron diffraction to detect the temporal evolution of non-equilibrium phonons in femtosecond laser-excited ultrathin single-crystalline gold films. From the time-dependence of the Debye-Waller factor, we extract a 4.7 ps time-constant for the increase in mean-square atomic displacements. The observed increase in the diffuse scattering intensity demonstrates that the energy transfer from laser-heated electrons to phonon modes near the X and K points in the Au fcc Brillouin zone proceeds with timescales of 2.3 and 2.9 ps, respectively, faster than the Debye-Waller average mean-square displacement.
Authors:
 [1] ;  [2] ; ; ;  [1] ; ; ; ; ; ; ;  [3] ;  [1] ;  [2] ;  [2]
  1. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  2. (United States)
  3. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
Publication Date:
OSTI Identifier:
22489351
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 4; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC DISPLACEMENTS; BRILLOUIN ZONES; DEBYE-WALLER FACTOR; DIFFUSE SCATTERING; ELECTRON DIFFRACTION; ENERGY TRANSFER; FCC LATTICES; FILMS; GOLD; LASERS; MONOCRYSTALS; PHONONS; TIME DEPENDENCE