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Title: Ultrafast and steady-state laser heating effects on electron relaxation and phonon coupling mechanisms in thin gold films

We study the scattering mechanisms driving electron-phonon relaxation in thin gold films via pump-probe time-domain thermoreflectance. Electron-electron scattering can enhance the effective rate of electron-phonon relaxation when the electrons are out of equilibrium with the phonons. In order to correctly and consistently infer electron-phonon coupling factors in films on different substrates, we must account for the increase in steady-state lattice temperature due to laser heating. Our data provide evidence that a thermalized electron population will not directly exchange energy with the substrate during electron-phonon relaxation, whereas this pathway can exist between a non-equilibrium distribution of electrons and a non-metallic substrate.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ; ; ;  [4]
  1. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States)
  2. (United States)
  3. Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106 (United States)
  4. Sandia National Laboratories, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22253917
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRON-PHONON COUPLING; ELECTRONS; GOLD; LASER-RADIATION HEATING; SCATTERING; SUBSTRATES; THIN FILMS