PHONON FOLDING IN ZNSE-ZNTE STRAINED-LAYER SUPERLATTICES

Folding of longitudinal acoustic (LA) mode phonons in ZnSe-ZnTe strain ed layer superlattices, grown on the (001) GaAs without buffer layers by molecular beam epitaxy (MBE), was measured as a function of period and thickness of the layers by Raman scattering. The dispersion relati on between observed LA frequencies and wave number of the superlattice s was analyzed by fitting the sound velocity as a parameter in the Ryt ov model. Two analytical solutions were obtained from the model. It is supported by consideration of calculation and experimental results th at the sound velocity of the ZnSe and ZnTe layers in the superlattices is smaller and larger than their bulk values respectively, and this i mplies elongation of the ZnSe layers and compression of the ZnTe layer s.