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VOLUME 61 (1995) | ISSUE 5 | PAGE 371
Confined optical phonons in the AlAs layers of GaAs/AlAs superlattices
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.