PHONON RAMAN-SCATTERING IN INSB IN1-XALXSB STRAINED-LAYER SUPERLATTICES/

Raman scattering has been used to study a variety of InSb/In1-xAlxSb s trained-layer superlattices grown by magnetron sputter epitaxy. The ob served frequencies of zone-folded longitudinal acoustic phonons agree well with those calculated using Rytov's theory of acoustic vibrations in layered media. The intensities of these phonons do not coincide wi th those calculated within the regime of the photoelastic mechanism fo r light scattering because the exciting light energy is close to reson ance with superlattice electronic transitions. The longitudinal optic phonons in In1-xAlxSb layers exhibit two-mode behavior and their shift due to the intralayer strain is discussed.