Multiphonon resonant Raman scattering in short-period GaAs/AlAs superlattices

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Abstract
We report a study of the multiphonon resonant Raman scattering in a series of short-period GaAs/AlAs superlattices. Up to fourth-order scattering is observed, involving both pure overtones of the first-order GaAs and AlAs optical phonons and combinations of phonons from the two materials. The nature of the phonons participating in this multiple scattering is investigated and their relative strengths, both as a function of laser excitation energy and sample layer thicknesses, are studied. Possible mechanisms for these processes are discussed.