Confined LO phonons in GaAs/AlAs superlattices
- 15 January 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (2), 1598-1603
- https://doi.org/10.1103/physrevb.43.1598
Abstract
We report the observation of both GaAs and AlAs confined LO phonons in short-period GaAs/AlAs superlattices. The measured GaAs mode frequencies are found to map well onto the bulk dispersion curve with a suitable choice of an effecive wave vector, confirming the validity of this technique for determining bulk phonon dispersions over at least the first half of the bulk Brillouin zone. The frequency separation of confined AlAs LO modes is found to be consistent with a weak dispersion of this branch along the [001] direction, in agreement with recent lattice-dynamic calculations.Keywords
This publication has 20 references indexed in Scilit:
- Phonon spectra of ultrathin GaAs/AlAs superlattices: Anab initiocalculationPhysical Review B, 1990
- Phonon dispersion in GaAsJournal of Physics: Condensed Matter, 1990
- Interface roughness and the dispersion of confined LO phonons in GaAs/AlAs quantum wellsPhysical Review B, 1988
- Raman scattering of (GaAs)n(AlAs)n superlatticesSolid State Communications, 1988
- Comment on "Resonance Raman Scattering by Confined LO and TO Phonons in GaAs-AlAs Superlattices"Physical Review Letters, 1986
- Soodet al.RespondPhysical Review Letters, 1986
- Raman scattering from (AlAs(GaAsultrathin-layer superlatticesPhysical Review B, 1986
- Interface Vibrational Modes in GaAs-AlAs SuperlatticesPhysical Review Letters, 1985
- Resonance Raman Scattering by Confined LO and TO Phonons in GaAs-AlAs SuperlatticesPhysical Review Letters, 1985
- Fundamental Energy Gaps of AlAs and Alp from Photoluminescence Excitation SpectraPhysical Review B, 1973