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- W2085846893 abstract "For ideal type-II GaAs/AlAs superlattices it was predicted that the coupling between $ensuremath{Gamma}$ and ${X}_{z}$ electron states is allowed (forbidden) if the number of monolayers in AlAs slabs is even (odd). We use a simpler structure, namely, a single GaAs/AlAs/GaAs type-II double quantum well with thickness gradient to show experimental evidence of the AlAs-monolayer dependence of the $ensuremath{Gamma}ensuremath{-}X$ coupling. A careful determination of layer thicknesses is obtained from electron microscopy and optical spectroscopy using additional quantum wells inserted in the structure. The results concerning the $ensuremath{Gamma}ensuremath{-}X$ coupling are obtained from the study of the ratio of photoluminescence intensities of the zero-phonon line and the phonon replica and from their time decay. The variation of the $ensuremath{Gamma}ensuremath{-}X$ coupling with AlAs thickness cannot be explained simply by the variation of the overlap of $ensuremath{Gamma}$ and ${X}_{z}$ envelope functions. It clearly shows the monolayer dependence of the $ensuremath{Gamma}ensuremath{-}X$ mixing potential. We develop a simple model to obtain the $ensuremath{Gamma}ensuremath{-}X$ coupling in the case of nonabrupt interfaces. The amplitude of variation of the radiative recombination time due to the $ensuremath{Gamma}ensuremath{-}X$ mixing is well reproduced within this model." @default.
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- W2085846893 date "2000-12-15" @default.
- W2085846893 modified "2023-09-30" @default.
- W2085846893 title "AlAs-monolayer dependence of theΓ−Xcoupling in GaAs-AlAs type-II heterostructures" @default.
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- W2085846893 doi "https://doi.org/10.1103/physrevb.62.16856" @default.
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