Time-resolved X-ray diffraction from coherent phonons during a laser-induced phase transition
Författare
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.
Avdelning/ar
Publiceringsår
2000
Språk
Engelska
Sidor
111-114
Publikation/Tidskrift/Serie
Physical Review Letters
Volym
84
Issue
1
Fulltext
- Available as PDF - 257 kB
- Download statistics
Dokumenttyp
Artikel i tidskrift
Förlag
American Physical Society
Ämne
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1079-7114