kxp theory of semiconductor superlattice electronic structure. II. Application to Ga/sub 1-x/In/sub x/As-Al/sub 1-y/In/sub y/As (100) superlattices
This is the second of a two-paper series in which we present a complete kxp theory of semiconductor superlattices. In the first paper, the formal theoretical results are presented. Here, the numerical implementation of these results is described and they are used to investigate the electronic structure of Ga/sub 1-x/In/sub x/As-Al/sub 1-y/In/sub y/As superlattices grown along the (100) direction. Three alloy composition pairs are considered: a lattice-matched case (x = 0.53, y = 0.52), a case where the Ga-containing layers are in biaxial tension with a 1% lattice mismatch (x = 0.53, y = 0.67) and a case where the Ga-containing layers are in biaxial compression with a 1% lattice mismatch (x = 0.53, y = 0.37). Our results for the superlattice energy band gap of the lattice-matched system are in good agreement with available experimental results. Calculations of subband energy dispersion for superlattice wave vectors both parallel and perpendicular to the growth axis are performed. These calculations show band-splitting and -mixing features not embodied within current envelope-function models which do not correctly describe the superlattice symmetry. However, these features are present in tight-binding models which do properly account for the superlattice symmetry. The origin of these band splitting and mixing features in the present kxp theory is discussed.
- Research Organization:
- Xerox Corporation, Webster Research Center, 800 Phillips Road (0114-41D), Webster, New York 14580
- OSTI ID:
- 5794539
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 33:12; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603 -- Materials-- Properties
656000* -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
BLOCH THEORY
DISPERSION RELATIONS
ELECTRONIC STRUCTURE
ENERGY GAP
FUNCTIONS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
HAMILTONIANS
INDIUM ARSENIDES
INDIUM COMPOUNDS
MATHEMATICAL OPERATORS
NUMERICAL SOLUTION
PNICTIDES
QUANTUM OPERATORS
SUPERLATTICES
WAVE FUNCTIONS