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

Författare:
  • 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
Publiceringsår: 2000
Språk: Engelska
Sidor: 111-114
Publikation/Tidskrift/Serie: Physical Review Letters - Moving Physics Forward
Volym: 84
Nummer: 1
Dokumenttyp: Artikel

Sammanfattning

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.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 0031-9007

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