Non-linear conductivity and quantum interference in disordered metals

Details Non-linear conductivity and quantum interference in disordered metals Non-linear conductivity and quantum interference in disordered metals

1999-05-17

arxiv.org/abs/cond-mat/9905240v1

European Physical Journal B 15, 277-281 (2000)

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 3 figures

Scientific paper

10.1007/s100510051126

We report on a novel non-linear electric field effect in the conductivity of disordered conductors. We find that an electric field gives rise to dephasing in the particle-hole channel, which depresses the interference effects due to disorder and interaction and leads to a non-linear conductivity. This non-linear effect introduces a field dependent temperature scale $T_E$ and provides a microscopic mechanism for electric field scaling at the metal-insulator transition. We also study the magnetic field dependence of the non-linear conductivity and suggest possible ways to experimentally verify our predictions. These effects offer a new probe to test the role of quantum interference at the metal-insulator transition in disordered conductors.

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