Abstract
Picosecond Raman studies on the prototypic alloys As and As show that substantial nonequilibrium phonon effects occur in spite of the break-down in wave-vector conservation engendered by alloy disorder. Phonon lifetimes, measured to be the same as in pure GaAs, also are unaffected by the disorder. Explicit expressions for the Fröhlich couplings of the two LO phonon modes in As are obtained to compare with the generation rates of these phonons measured in our experiments.
- Received 15 October 1986
DOI:https://doi.org/10.1103/PhysRevLett.58.1869
©1987 American Physical Society