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Phys. Rev. B 65, 144304 (2002) [4 pages]

Coherent phonon generation and the two stimulated Raman tensors

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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

Received 22 January 2002; published 28 March 2002

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.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.65.144304
DOI: 10.1103/PhysRevB.65.144304
PACS: 78.30.-j, 42.65.Dr, 42.65.Re, 78.47.+p

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

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