Nonohmic conductivity as a probe of crossover from diffusion to hopping in two dimensions
arXiv:cond-mat/0312118 · doi:10.1016/j.physe.2004.05.006
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 .
4 pages, 2 figures