Nonohmic conductivity as a probe of crossover from diffusion to hopping in two dimensions

Details Nonohmic conductivity as a probe of crossover from diffusion to hopping in two dimensions Nonohmic conductivity as a probe of crossover from diffusion to hopping in two dimensions

2003-12-04

arxiv.org/abs/cond-mat/0312118v1

Physica E 25, 42 (2004)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures

Scientific paper

10.1016/j.physe.2004.05.006

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 $10^{-2}e^2/h$.

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