Phonon spectra of ultrathin GaAs/AlAs superlattices: Anab initiocalculation
Open Access
- 15 February 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 41 (6), 3870-3873
- https://doi.org/10.1103/physrevb.41.3870
Abstract
Phonon spectra of ultrathin (GaAs(AlAs (001) superlattices are studied theoretically using linear-response density-functional techniques. Results are presented for n=1,2,3 superlattices, along with prototype supercell calculations aimed at simulating a completely disordered (alloy) as well as some partially disordered superlattices. Besides interfacial disorder, which modifies the effective confinement length of low-order longitudinal-optic phonons, we find that—in the ultrathin regime—some degree of cationic mixing must also affect inner planes in order to explain experimental findings.
Keywords
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