Nonohmic conductivity as a probe of crossover from diffusion to hopping in two dimensions
Abstract
We show that the study of conductivity nonlinearity gives a possibility to determine the condition when the diffusion conductivity changes to the hopping one with increasing disorder. It is experimentally shown that the conductivity of single quantum well GaAs/InGaAs/GaAs heterostructures behaves like diffusive one down to value of order 10-2e2/h.
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