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- W2000479097 abstract "A theory of phonon-assisted intervalley ensuremath{Gamma}-X transfer in periodic heterostructures GaAs/AlAs is developed on the basis of the envelope-function approximation. Matrix elements of intervalley transitions are expressed through the overlap integrals of ensuremath{Gamma} and X envelope functions with use of ensuremath{Gamma}-X intervalley deformation potential constants of bulk GaAs and AlAs. The phonon spectrum of an ideal GaAs/AlAs periodic heterostructure is studied in a microscopic approach. It is shown that phonons responsible for intervalley transitions are GaAs-like and AlAs-like X-point LO phonons, confined within GaAs and AlAs layers, respectively. ensuremath{Gamma}-X transfer times due to phonon-assisted scattering are calculated for the problem of photoexcited-electron relaxation in the type-II GaAs/AlAs superlattices and compared with the transfer times due to the phononless transition mechanism (ensuremath{Gamma}-X mixing). Both phonon-assisted ensuremath{Gamma}-X scattering and ensuremath{Gamma}-X mixing are important for the determination of ensuremath{Gamma}-X transfer times. The calculated values of ensuremath{Gamma}-X transfer times and their dependence on GaAs and AlAs layer thicknesses are in agreement with the experimental data." @default.
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- W2000479097 date "1994-02-15" @default.
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- W2000479097 title "Phonon-assisted Γ-<i>X</i>transfer in (001)-grown GaAs/AlAs superlattices" @default.
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- W2000479097 doi "https://doi.org/10.1103/physrevb.49.5448" @default.
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