Abstract
We present resonant Raman experiments on first-order disorder-activated bands in Ga1−xAlxAs alloys. Selective enhancements occur, in particular, in the acoustic region. These resonances enable us to assign unambiguously the features revealed and to determine their mode behaviour. The enhanced disorder-activated bands are compared with the structures appearing in the Raman spectra of GaAs-AlAs superlattices.
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