Zone-Folding Effects on Phonons in GaAs-AlAs Superlattices
| Autor: | Masaaki Nakayama, Hiromu Kato, Kanji Kubota, Naokatsu Sano, Shigeaki Chika, T. Kanata |
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| Rok vydání: | 1985 |
| Předmět: |
Physics
Condensed matter physics Phonon Superlattice General Engineering General Physics and Astronomy Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Epitaxy Curvature Condensed Matter::Materials Science symbols.namesake symbols Electronic band structure Raman spectroscopy Raman scattering |
| Zdroj: | Japanese Journal of Applied Physics. 24:1331 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.1143/jjap.24.1331 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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