Zone-Folding Effects on Phonons in GaAs-AlAs Superlattices
- 1 October 1985
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 24 (10R), 1331-1334
- https://doi.org/10.1143/jjap.24.1331
Abstract
Raman spectroscopy has been used to study the zone-folding effects on both longitudinal acoustic (LA) and longitudinal optic (LO) phonons in (GaAs) n -(AlAs) n superlattices with integral n (2 ∼12) grown by molecular-beam epitaxy. All the observed frequencies of the zone-foled LA phonon modes up to the sixth order agree well with those calculated using the elastic model, while the observed frequencies of the zeroth- and first-order zone-folded LO phonon modes agree with those calculated using the linear-chain model. However, since long-range interactions are neglected in the linear-chain model, this model is not a good approximation for the higher-order modes. In contrast to the LA phonon modes, all the GaAs- and AlAs-like LO phonon modes are confined in the GaAs and AlAs layers, respectively.Keywords
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