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- W1967962068 abstract "Band-edge optical transitions in GaAs/AlAs superlattices with different miniband widths are investigated by low-temperature-photocurrent, photoluminescence-excitation, and reflectance spectroscopy. Direct spectroscopic evidence is given for excitonic effects at saddle-type critical points which are related to ${mathit{M}}_{1}$ Van Hove singularities at the upper miniband edges, for both heavy-hole and light-hole excitons. Excellent agreement is obtained between the observed transition energies and the miniband widths deduced from Kronig-Penney model calculations." @default.
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- W1967962068 date "1994-01-15" @default.
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- W1967962068 title "Direct observation of miniband-edge singularities in the optical spectra of GaAs/AlAs superlattices" @default.
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- W1967962068 doi "https://doi.org/10.1103/physrevb.49.1809" @default.
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