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Raman-scattering spectroscopy has been used to study the folded longitudinal-acoustic (FLA) phonons in three- and four-layer superlattices comprised variously of slabs of GaAs, Ga_1-x{Al}ₓ$As, and AlAs. For each superlattice, the observed FLA peak frequencies recorded with different exciting wavelengths agree very well with the calculated dispersion relation based on an elastic-continuum model. However, apart from some qualitative trends in the three-layer superlattices, the relative intensities of the Raman FLA peaks are not well reproduced by the photoelastic theory of a perfect superlattice. Reasons for this discrepancy are discussed. The three-layer superlattices exhibited a high photoluminescence efficiency, comparable to that of strained Ga_1-x{In}ₓ$As/GaAs single quantum wells.
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Lockwood et al. (1993) studied this question.
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