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Phys Rev Lett
; 84(1): 111-4, 2000 Jan 03.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11015847
RESUMO
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.
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Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics
; 49(1): 671-677, 1994 Jan.
Artigo
em Inglês
| MEDLINE
| ID: mdl-9961261
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