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VOLUME 50 (1989) | ISSUE 1 | PAGE 32
Light scattering by optical phonons trapped in AlAs layer in (GaAs)m(AlAs)n superlattice
A Raman scattering by LO phonons trapped within an AlAs layer in a (GaAs) m (Al As) „ (m = 7, η = 18) superlattice has been observed. When specific atoms (Ga, Al, As) were put in Wyckoif positions, it was found that the contributions of the displacements of these atoms to vibrations of a certain symmetry Γ,, Γ2, Г5 depends on m and n. It thus becomes possible to extract information about the microstructure and the quality of the superlattices within a single monolayer.