Transient strain driven by a dense electron-hole plasma

We measure transient strain in ultrafast laser-excited Ge by time-resolved x-ray anomalous transmission. The development of the coherent strain pulse is dominated by rapid ambipolar diffusion. This pulse extends considerably longer than the laser penetration depth because the plasma initially propag...

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Bibliographic Details
Published inPhysical review letters Vol. 91; no. 16; p. 165502
Main Authors DeCamp, M F, Reis, D A, Cavalieri, A, Bucksbaum, P H, Clarke, R, Merlin, R, Dufresne, E M, Arms, D A, Lindenberg, A M, MacPhee, A G, Chang, Z, Lings, B, Wark, J S, Fahy, S
Format Journal Article
LanguageEnglish
Published United States 17.10.2003
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Summary:We measure transient strain in ultrafast laser-excited Ge by time-resolved x-ray anomalous transmission. The development of the coherent strain pulse is dominated by rapid ambipolar diffusion. This pulse extends considerably longer than the laser penetration depth because the plasma initially propagates faster than the acoustic modes. X-ray diffraction simulations are in agreement with the observed dynamics.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.91.165502