Anisotropy of optical phonons and interface modes in GaAs-AlAs superlattices
- 15 May 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 37 (15), 8899-8911
- https://doi.org/10.1103/physrevb.37.8899
Abstract
In this paper phonon properties of GaAs-AlAs superlattices are studied with an 11-parameter rigid-ion model. Short-range interactions up to the second neighbors are included, and the long-range Coulomb interaction is calculated exactly. Modes propagating both normally (=0) and obliquely (≠0) to the interfaces are studied for a number of GaAs-AlAs superlattices. Anisotropy of zone-center optical phonons is examined in detail. Phonon dispersion relations of large-size GaAs-AlAs superlattices are calculated and many interface modes are identified. All results are compared with the existing experimental data with favorable agreement.
Keywords
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