(111) oriented (GaAs)n(AlAs)n superlattices are direct band-gap materials for all n’s
- 21 November 1988
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 53 (21), 2077-2079
- https://doi.org/10.1063/1.100415
Abstract
Total energy calculations show that the (111) (AlAs)n(GaAs)n superlattice has a lower formation enthalpy (i.e., is stabler) than either the (001) or (110) superlattices. Self‐consistent band structure calculations further show that while the (001) superlattice is direct only for n>7, the (111) superlattice has (i) a smaller and (ii) a direct (not pseudodirect) gap for all n’s. Contrary to the expectations based on particle in a box models, the confined states at the zone center are strongly localized even for the monolayer superlattice.Keywords
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