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- W2067509062 abstract "A detailed experimental study of the real-space ensuremath{Gamma}-X transfer in type-II GaAs/AlAs short-period superlattices and in type-II ${mathrm{Al}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As/AlAs multiple-quantum-well structures is presented. Transfer times on a subpicosecond and picosecond time scale are observed. The time constants critically depend on the thickness of the (Al,Ga)As layers, but not on the AlAs-layer thickness in the samples studied. The ensuremath{Gamma}-X transfer rate is determined by the spatial overlap of the ensuremath{Gamma} and X wave functions confined in the different layers. Intensity- and temperature-dependent measurements provide insight into the scattering mechanism. We conclude that electron--LO-phonon scattering is the dominant scattering process for samples with thick (Al,Ga)As layers (>100 AA{}). In contrast, interface scattering due to the interface mixing potential (ensuremath{Gamma}-${mathit{X}}_{mathit{z}}$ mixing) and/or due to potential fluctuations caused by interface roughness (ensuremath{Gamma}-${mathit{X}}_{mathit{x},}$y mixing) probably dominates for samples with thin (Al,Ga)As layers (35 AA{})." @default.
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- W2067509062 date "1990-09-15" @default.
- W2067509062 modified "2023-10-14" @default.
- W2067509062 title "Experimental study of the Γ-<i>X</i>electron transfer in type-II (Al,Ga)As/AlAs superlattices and multiple-quantum-well structures" @default.
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- W2067509062 doi "https://doi.org/10.1103/physrevb.42.5809" @default.
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