Non-Gaussian Current Fluctuations in a Short Diffusive Conductor

TL;DR

This paper measures the third moment of current fluctuations in a short metallic wire, confirming theoretical predictions at low bias and exploring transport regimes at higher bias.

Contribution

It provides experimental data on non-Gaussian current fluctuations in a diffusive conductor, including the crossover from elastic to inelastic transport.

Findings

Third moment measurements agree with theory at low bias

Environmental effects are carefully accounted for

Transport crossover observed at higher bias

Abstract

We report the measurement of the third moment of current fluctuations in a short metallic wire at low temperature. The data are deduced from the statistics of voltage fluctuations across the conductor using a careful determination of environmental contributions. Our results at low bias agree very well with theoretical predictions for coherent transport with no fitting parameter. By increasing the bias voltage we explore the cross-over from elastic to inelastic transport.