Raman scattering has been performed on GaSb/AlSb strained-layer superlattices with periods varying from 65 to 300 A{}. Discrete quantum confined GaSb longitudinal optical phonons are observed in GaSb layers less than 25 A{} thick. The confinement-induced {Γ}-to-L crossover in GaSb manifests itself in our spectra via the observation of optical-phonon density-of-states structure. This structure disappears for GaSb layers thicker than 50 A{}. Spatially extended interface modes have been observed in all superlattices in both the GaSb and AlSb optical-mode spectra.
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Schwartz et al. (1987) studied this question.
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