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Non-linear conductivity and quantum interference in disordered metals

M. Leadbeater·R. Raimondi·P. Schwab·C. Castellani
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Abstract

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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M. Leadbeater, R. Raimondi, P. Schwab, C. Castellani. 1999-05-17. Non-linear conductivity and quantum interference in disordered metals. https://doi.org/10.1007/s100510051126

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