Coherent phonon generation and the two stimulated Raman tensors

T. E. Stevens, J. Kuhl, and R. Merlin
Phys. Rev. B 65, 144304 – Published 28 March 2002
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Abstract

We show that stimulated Raman scattering by phonons is described by two separate tensors, one of which accounts for the phonon-induced modulation of the susceptibility, and the other one for the dependence of the coherent mode amplitude on the light intensity. These tensors have the same real component, associated with impulsive generation of phonons, but different imaginary parts. If the imaginary term dominates, the mechanism for two-band processes is displacive in nature. Femtosecond pump-probe experiments on antimony, using laser energies in the range of the E2 gap, support the two-tensor model.

  • Received 22 January 2002

DOI:https://doi.org/10.1103/PhysRevB.65.144304

©2002 American Physical Society

Authors & Affiliations

T. E. Stevens1,2,*, J. Kuhl2, and R. Merlin1

  • 1The Harrison M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1120
  • 2Max-Planck-Institut für Festkörperforschung, D-70569, Stuttgart, Germany

  • *Present address: Veridian ERIM International, P.O. Box 134008, Ann Arbor, Michigan 48113-4008.

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Vol. 65, Iss. 14 — 1 April 2002

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