Chemical shift and zone-folding effects on the energy gaps of GaAs-AlAs (001) superlattices

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.9951· OSTI ID:5558150

Zhang, S B ^[1]; Cohen, M L; Louie, S G ^[2]

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1. Department of Physics, University of California, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (USA) Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, California 94304 (USA)
2. Department of Physics, University of California, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (USA)

The chemical shift and zone-folding effects obtained from quasiparticle calculations for ultrathin GaAs-AlAs superlattices are incorporated within a Kronig-Penny model for superlattices of the arbitrary lattice period. We determine that superlattices with lattice periods in the range of 3{times}3 to 9{times}9 have an {ital X}-derived pseudodirect gap. This result explains both the results from first-principles calculations for ultrathin superlattices and those from experiments for a broader lattice period.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5558150
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:12; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ARSENIDES
CHEMICAL SHIFT
ENERGY GAP
GALLIUM ARSENIDES
BAND THEORY
INTERFACES
SUPERLATTICES
THIN FILMS
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
FILMS
GALLIUM COMPOUNDS
PNICTIDES
360603* - Materials- Properties