Transient strain driven by a dense electron-hole plasma

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Date
2003
Authors
DeCamp, Matthew F.
Reis, David A.
Cavalieri, A
Bucksbaum, Philip H.
Clarke, Roy
Merlin, Roberto
Dufresne, E. M.
Arms, D. A.
Lindenberg, Aaron M.
MacPhee, A. G.
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American Physical Society
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Abstract
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.
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Keywords
X-ray diffraction , Picosecond light pulses , Lattice dynamics , Generation , Germanium , Disorder , Surfaces , Crystals , Phonons
Citation
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. and Fahy, S. (2003) 'Transient strain driven by a dense electron-hole plasma', Physical Review Letters, 91(16), 165502 (4pp). doi: 10.1103/PhysRevLett.91.165502
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© 2003, American Physical Society