Quasiparticle band gaps for ultrathin GaAs/AlAs(001) superlattices

Journal Article · Mon Oct 02 00:00:00 EDT 1989 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.63.1495· OSTI ID:5300245

Zhang, S B; Cohen, M L; Louie, S G; Tomanek, D ^[1]; Hybertsen, N S ^[2]

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1. Department of Physics, University of California (USA) Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (USA)
2. AT T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (USA)

The quasiparticle band energies for 1{times}1 and 2{times}2 GaAs/AlAs(001) superlattices have been calculated from first principles using a self-energy approach. Both superlattices have indirect band gaps. The pseudodirect gaps at the zone center derived from folding of the Brillouin zone are larger than the direct gaps. The calculated results explain the various experimental data quantitatively. Matrix elements for optical transitions near the zone center show significant anisotropy. The effects of disorder on the observed spectra are discussed.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5300245
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 63:14; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
DIMENSIONS
ELECTRONIC STRUCTURE
ENERGY GAP
ENERGY-LEVEL TRANSITIONS
FILMS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
MATRIX ELEMENTS
PNICTIDES
QUASI PARTICLES
RANDOMNESS
SUPERLATTICES
THICKNESS
THIN FILMS