Time-resolved X-ray diffraction from coherent phonons during a laser-induced phase transition
Author
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
Full text
- Available as PDF - 257 kB
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Document type
Journal article
Publisher
American Physical Society
Topic
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Other
- ISSN: 1079-7114