Data on ac and dc field dependence of the conductivity of semi-insulating GaAs crystals are reported. The existence of long-range potential fluctuations in these samples has been previously reported. Field-enhanced conductivity results from the decrease of the maximum depth of the wells due to barrier lowering, up to a critical field at which the effect of potential fluctuations disappears. The transient behavior is also discussed.
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Pistoulet et al. (1986) studied this question.
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