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Scholz R, Jancu JM, Bassani F. Superlattice Calculation in an Empirical spds* Tight-Binding Model. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-491-383] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe propose an empirical tight-binding method for tetrahedrally coordinated cubic materials and apply it to group IV and III-V semiconductors, extending existing calculations by the inclusion of all five d-orbitals per atom in the basis set. The symmetry character of the conduction states at the surface of the Brillouin zone is considerably improved compared to calculations in smaller bases, and the corresponding band positions can be obtained within the experimental uncertainties. Because the distance dependence of the tight-binding parameters is derived from deformation potentials, the model is particularly suited for an investigation of strained superlattices where the states at direct or pseudo-direct conduction band minima are composed of wavefunctions of all the minima at Γ, X, and L of the constituents. Investigations of GaAs/AlAs and short-period superlattices indicate a strong mixing between the conduction band valleys in the miniband structure, and the results are in better agreement with experiments than state-of-the-art empirical pseudopotential calculations.
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Franceschetti A, Zunger A. Quantum-confinement-induced Gamma -->X transition in GaAs/AlGaAs quantum films, wires, and dots. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:14664-14670. [PMID: 9980800 DOI: 10.1103/physrevb.52.14664] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mäder KA, Zunger A. Empirical atomic pseudopotentials for AlAs/GaAs superlattices, alloys, and nanostructures. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:17393-17405. [PMID: 9976143 DOI: 10.1103/physrevb.50.17393] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Burnett JH, Cheong HM, Paul W, Koteles ES, Elman B. Gamma -X mixing in GaAs/AlxGa1-xAs coupled double quantum wells under hydrostatic pressure. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:1991-1997. [PMID: 10006236 DOI: 10.1103/physrevb.47.1991] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Leroux M, Grandjean N, Chastaingt B, Deparis C, Neu G, Massies J. Confined electron states in ultrathin AlAs single quantum wells under pressure. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:11846-11853. [PMID: 10001200 DOI: 10.1103/physrevb.45.11846] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Reimann K, Holtz M, Syassen K, Lu YC, Bauser E. Pressure dependence of the indirect band gap of AlxGa1-xAs alloys (x=0.70 and 0.92) at low temperatures. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:2985-2990. [PMID: 9999889 DOI: 10.1103/physrevb.44.2985] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Young JF, Charbonneau S, Coleridge PT. Determination of Xz-Xx,y energy separation and intervalley relaxation times in type-II AlxGa1-xAs/AlAs multiple quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:11434-11437. [PMID: 9995449 DOI: 10.1103/physrevb.42.11434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xia JB, Chang YC. Electronic structures and optical properties of short-period GaAs/AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:1781-1790. [PMID: 9995611 DOI: 10.1103/physrevb.42.1781] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xia JB. Gamma -X mixing effect in GaAs/AlAs superlattices and heterojunctions. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:3117-3122. [PMID: 9994087 DOI: 10.1103/physrevb.41.3117] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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