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- W2007014191 abstract "The influence of imperfections and weak disorder on the vertical charge transport in semiconductor superlattices at high electric fields is investigated. We present numerical simulations of the stable high-field domain states and of the self-generated spatio-temporal current oscillations, and demonstrate that the current - voltage characteristics in the regime of domain formation are extremely sensitive to small amounts of disorder introduced by fluctuations of the well and barrier widths as well as the doping densities in the growth direction. Comparison with experiment shows that such fluctuations can explain the irregularity of the current branches observed in the measured characteristics. It is possible to identify the location of a single imperfection within the superlattice structure from the calculated current - voltage characteristics. Disorder also strongly affects the regime in which oscillatory current instabilities occur as well as the frequency and the mode of the oscillations. We propose to use these investigations as a novel method to detect growth-related imperfections in a superlattice." @default.
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- W2007014191 date "1996-04-01" @default.
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- W2007014191 title "The influence of imperfections and weak disorder on domain formation in superlattices" @default.
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- W2007014191 doi "https://doi.org/10.1088/0268-1242/11/4/003" @default.
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