Confined optical phonons in the AlAs layers of GaAs/AlAs superlattices
Haisler V. A. , Tenne D. A., Moshegov N. T. , Toropov A. I. , Marakhovka I. I. , Shebanin A. P.
The phonon spectrum of high-quality GaAs/AlAs superlattices has been studied in the region of AlAs frequencies by a Raman-scattering method. Peaks corresponding to longitudinal optical phonons with a quantization order of 1-5 were resolved in the spectra. The experimental results support the results of a microscopic calculation of the dispersion of LO phonons of bulk AlAs.