Abstract
Abstract A linear response theory of Raman scattering by the longitudinal polar optical modes in ionic superlattices is considered. Derivations are first given for the characteristic response functions whose poles define the dispersion relation. This is examined in an application to a specific GaAs/Ga1−xAlxAs superlattice predicting the familiar zone-folding effects. From the response functions we derive the scattering cross section, taking proper account of the polarisation selection rules in cubic materials. This leads to the derivation of the Raman intensities of the folded modes and their variation with the scattering geometry. Results appropriate for the normal incidence backscattering case are deduced and compared with the corresponding experimental data.
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