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Supersonic strain front driven by a dense electron-hole plasma

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arxiv cond-mat/0301002 v1 pith:IJYDQZJB submitted 2002-12-31 cond-mat.mtrl-sci

M. F. DeCamp , D. A. Reis , A. Cavalieri , P. H. Bucksbaum , R. Clarke , R. Merlin , E. M. Dufresne , D. A. Arms
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A. M. Lindenberg A. G. MacPhee Z. Chang B. Lings J. S. Wark S. Fahy
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classification cond-mat.mtrl-sci
keywords electron-holeplasmastraincoherentdiffusiondrivenfrontpulse
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We study coherent strain in (001) Ge generated by an ultrafast laser-initiated high density electron-hole plasma. The resultant coherent pulse is probed by time-resolved x-ray diffraction through changes in the anomalous transmission. The acoustic pulse front is driven by ambipolar diffusion of the electron-hole plasma and propagates into the crystal at supersonic speeds. Simulations of the strain including electron-phonon coupling, modified by carrier diffusion and Auger recombination, are in good agreement with the observed dynamics.

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