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Phys Rev Lett. 2000 Jan 3;84(1):111-4.

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

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Department of Physics, University of California, Berkeley, California 94720, USA.


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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