We demonstrate for the first time the well-defined dispersive character of optical phonons in III-V mixed crystals. Raman scattering on short period GaAlAs/AlAs superlattices evidences several modes confined in the alloy layers. This determines experimental points on the bulk-alloy phonon dispersion curves in agreement with the predictions of a coherent potential approximation calculation which takes into account both disorder and superlattice effects.
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Jusserand et al. (1989) studied this question.
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