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- W2023963561 abstract "We have carried out full-scale pseudopotential calculations on (GaAs${)}_{mathrm{n}}$-(AlAs${)}_{mathrm{n}}$ superlattices (n>2) to determine the relative alignment of the superlattice conduction states derived from the secondary bulk X minima. These are states characterized by contributions from the bulk minima oriented along the growth axis 〈001〉 (${X}_{z}$) and states characterized by the bulk (010) (${X}_{y}$) and (100) (${X}_{x}$) minima that lie in the plane of the interfaces. We present the splitting in energy of ${X}_{z}$ and ${X}_{x}$,${X}_{y}$ levels for 2<n<15 and report that the lowest superlattice state is related to ${X}_{z}$. We discuss the origin of this splitting, determine the oscillator strengths of optical transitions to the valence band, and compare with experimental data. We argue that the position of the ${X}_{x}$,${X}_{y}$ levels may be used to assess the quality of the interface at the microscopic level." @default.
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- W2023963561 date "1989-09-15" @default.
- W2023963561 modified "2023-09-26" @default.
- W2023963561 title "Splitting of the states derived from the bulk<i>X</i>minima in GaAs-AlAs superlattices" @default.
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- W2023963561 doi "https://doi.org/10.1103/physrevb.40.6413" @default.
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