Quasiparticle excitations in GaAs[sub 1[minus][ital x]]N[sub [ital x]] and AlAs[sub 1[minus][ital x]]N[sub [ital x]] ordered alloys

Journal Article · Wed Feb 15 04:00:00 EST 1995 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.4343· OSTI ID:6869771

Rubio, A; Cohen, M L ^[1]

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1. Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)

We have performed a quasiparticle study of the fundamental excitations in ordered alloys of III-V semiconductors, GaAs[sub 1[minus][ital x]]N[sub [ital x]] and AlAs[sub 1[minus][ital x]]N[sub [ital x]]. The experimentally observed anomalous redshift in GaAs[sub 1[minus][ital x]]N[sub [ital x]] of the direct band edge is explained here by effects arising from the 20% lattice mismatch. The fact that the bottom of the conduction band is mainly dominated by nitrogen leads to a large reduction of the fundamental gap at [Gamma] as the volume increases. This reduction continues until the charge density begins to locate on the arsenic site. Based on this simple scenario, we predict that a similar redshift may be observed in the indirect gap AlAs[sub 1[minus][ital x]]N[sub [ital x]] alloys. Also an indirect to direct band-gap transition will be observed for intermediate N concentrations. The possibility of closing the band gap is discussed in terms of the quasiparticle results.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6869771
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:7; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
665000 -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
BAND THEORY
COLLECTIVE EXCITATIONS
ENERGY-LEVEL TRANSITIONS
EXCITATION
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
LUMINESCENCE
NITROGEN ADDITIONS
PHOTOLUMINESCENCE
PNICTIDES
QUASI PARTICLES
SUBSTOICHIOMETRY