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Ab initio calculations of the anisotropic dielectric tensor of GaAs/AlAs superlattices

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  • Ab initio calculations of the anisotropic dielectric tensor of GaAs/AlAs superlattices
Author
Silvana Botti
N Vast
Lucia Reining
Olevano V
LC Andreani
Keywords
paper
Abstract

The static dielectric properties of (001)(GaAs)(p)/(AlAs)(p) superlattices have been calculated as a function of their period p for 1 less than or equal to p less than or equal to 12, starting from density-functional theory. The interplay between quantum confinement and local field effects is shown to be crucial. For light polarized in the growth direction it leads to the otherwise surprising justification of the use of a classical effective medium theory, even for the smallest periods. Only the inclusion of both contributions allows in ab initio and in semiempirical calculations to reproduce the experimentally observed birefringence.

Year of Publication
2002
Journal
Phys. Rev. Lett.
Volume
89
Date Published
NOV 18
URL
http://dx.doi.org/10.1103/PhysRevLett.89.216803
DOI
10.1103/PhysRevLett.89.216803
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