Zero-current voltage oscillations and non-linear transport in Quantum Hall GaAs-AlGaAs heterostructures

Abstract

Zero-current voltage oscillations in Quantum Hall samples have been reported in literature. Its origin is not yet understood. Here we propose a possible explanation based on a thermoelectric effect caused by noise input and local differences in the carrier density near the voltage contacts. Experiments on non-linear transport in GaAs-AlGaAs heterostructures are presented.