Light scattering from quantum confined and interface optical vibrational modes in strained-layer GaSb/AlSb superlattices
- 15 September 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 36 (9) , 4868-4877
- https://doi.org/10.1103/physrevb.36.4868
Abstract
Raman scattering has been performed on GaSb/AlSb strained-layer superlattices with periods varying from 65 to 300 Å. Discrete quantum confined GaSb longitudinal optical phonons are observed in GaSb layers less than 25 Å thick. The confinement-induced Γ-to-L crossover in GaSb manifests itself in our spectra via the observation of optical-phonon density-of-states structure. This structure disappears for GaSb layers thicker than 50 Å. Spatially extended interface modes have been observed in all superlattices in both the GaSb and AlSb optical-mode spectra.Keywords
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