Effect of interface disorder on the confined phonon modes of GaAs/AlAs superlattices
- 15 October 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 44 (16) , 9114-9117
- https://doi.org/10.1103/physrevb.44.9114
Abstract
We study the longitudinal optical-phonon modes in GaAs/AlAs(001) superlattices with disordered interface, using an 11-parameter rigid-ion model and the coherent-potential approximation. We show that, due to interface disorder, the frequencies of the confined modes deviate substantially from the bulk dispersion curve, the zone-center optical anisotropy is reduced, and the electrostatic interface modes show in the Raman spectrum. Our results are in good agreement with existing Raman measurements.Keywords
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