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Time-resolved X-ray diffraction from coherent phonons during a laser-induced phase transition

Author

  • A. M Lindenberg
  • I Kang
  • S. L Johnson
  • T Missalla
  • P. A Heimann
  • Z Chang
  • Jörgen Larsson
  • P. H Bucksbaum
  • H. C Kapteyn
  • H. A Padmore
  • R. W Lee
  • J. S Wark
  • R. W Falcone

Summary, in English

Time-resolved x-ray diffraction with picosecond temporal resolution is used to observe scattering from impulsively generated coherent acoustic phonons in laser-excited InSb crystals. The observed frequencies and damping rates are in agreement with a model based on dynamical diffraction theory coupled to analytic solutions for the laser-induced strain profile. The results are consistent with a 12 ps thermal electron-acoustic phonon coupling time together with an instantaneous component from the deformation-potential interaction. Above a critical laser fluence, we show that the first step in the transition to a disordered state is the excitation of large amplitude, coherent atomic motion.

Department/s

Publishing year

2000

Language

English

Pages

111-114

Publication/Series

Physical Review Letters

Volume

84

Issue

1

Document type

Journal article

Publisher

American Physical Society

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114