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- W2004973052 abstract "We have used local pseudopotentials with spin-orbit coupling to calculate electronic and optical properties of (GaAs)N (AlAs)N (001) superlattices with the number of atomic monolayers N ranging from 1 to 28. We show that for N ⪅ 8, the lowest conduction band (confined) state is derived primarily from states with momentum components associated with the Δ5 minima in the bulk Brillouin zone. Transitions across the fundamental gap of the superlattice which are normally regarded as being forbidden become allowed as a result of strong zone-folding. By comparing our results with experimental results of Ishibashi et al, we show that the concept of a band offset holds even for the superlattice whose period is only 2 lattice constants. Specifically, for the (GaAs)2 (AlAs)2 (001) superlattice, we suggest that the effective band offset lies in the range 75:25 to 63:37 and that the quasi-indirect exciton binding energy for the HH1-EX1 pair lies in the range 10 to 32 meV. We also resolve the question of the small temperature dependence of the superlattice energy gap which was raised by the work of Ishibashi et al." @default.
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- W2004973052 date "1987-01-01" @default.
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- W2004973052 title "Band offsets and zone-folding in GaAsAlAs (001) superlattices" @default.
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- W2004973052 doi "https://doi.org/10.1016/0749-6036(87)90043-7" @default.
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