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- W2067076227 abstract "We report an electrical transport and electroluminescence (EL) spectroscopy study of single-barrier GaAs-AlAs-GaAs $pensuremath{-}iensuremath{-}n$ tunnel structures with a barrier thickness in the range 4.5--8.0 nm. The results permit us to determine directly the relative roles of nonresonant ensuremath{Gamma}-ensuremath{Gamma} tunneling and resonant $ensuremath{Gamma}ensuremath{-}Xensuremath{-}ensuremath{Gamma}$ intervalley transfer in the transport through the indirect-gap tunnel barriers. The $ensuremath{Gamma}ensuremath{-}Xensuremath{-}ensuremath{Gamma}$ transport is shown to take place predominantly without conservation of transverse wave vector ${(k}_{ensuremath{parallel}}),$ with ${k}_{ensuremath{parallel}}$-conserving scattering via ${X}_{z}$ states only significantly close to the onset of $ensuremath{Gamma}ensuremath{-}X$ intervalley transfer. By detecting extremely weak EL arising from excited ${X}_{z}$ states we show that the complete $ensuremath{Gamma}ensuremath{-}Xensuremath{-}ensuremath{Gamma}$ transport process is very strongly sequential and determine, quantitatively, the comparative time scales for $Xensuremath{-}ensuremath{Gamma}$ and inter-X-level scattering. The bias-dependent $ensuremath{Gamma}ensuremath{-}Xensuremath{-}ensuremath{Gamma}$ and ensuremath{Gamma}-ensuremath{Gamma} transport times are determined for AlAs barrier widths in the range 3.0--10 nm. The intervalley $ensuremath{Gamma}ensuremath{-}Xensuremath{-}ensuremath{Gamma}$ transport model yields results in good agreement with experiment and demonstrates that, providing intervalley $ensuremath{Gamma}ensuremath{-}X$ transfer is energetically possible, nonresonant ensuremath{Gamma}-ensuremath{Gamma} tunneling only contributes significantly to the transport characteristics for barrier widths of ensuremath{sim}3 nm or less." @default.
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- W2067076227 date "1998-10-15" @default.
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- W2067076227 title "Role of the<i>X</i>minimum in transport through AlAs single-barrier structures" @default.
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- W2067076227 doi "https://doi.org/10.1103/physrevb.58.10619" @default.
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