Current noise, electron-electron interactions, and quantum interference

TL;DR

This paper demonstrates that electron-electron interactions induce a new quantum-interference effect in non-equilibrium current noise within mesoscopic conductors, revealing a voltage-dependent quadratic spectrum with dimensionality-dependent power-law frequency behavior.

Contribution

It introduces a novel quantum-interference contribution to current noise caused by electron-electron interactions in mesoscopic systems.

Findings

Noise spectrum is quadratic in voltage.

Frequency spectrum follows a power-law with an exponent depending on dimensionality.

Detailed spectrum derived for diffusive systems.

Abstract

It is shown that electron-electron interactions lead to a novel quantum-interference contribution to non-equilibrium current noise in mesoscopic conductors. The corresponding noise spectrum is obtained in detail for diffusive systems. It is found to be quadratic in the applied voltage and to exhibit a power-law frequency spectrum whose exponent depends on the dimensionality of the sample.