Sub-Poissonian shot noise in non-degenerate diffusive conductors

TL;DR

This paper develops a theoretical framework explaining the universal reduction of shot noise in non-degenerate diffusive conductors due to Coulomb repulsion, aligning with previous computer simulation observations.

Contribution

It introduces a universal theory for shot noise suppression in high-voltage space-charge limited conduction, accounting for dimensionality effects.

Findings

Shot noise is universally reduced below uncorrelated levels.

Reduction factor depends on the dimensionality of the density of states.

The theory explains previous simulation results across different dimensions.

Abstract

A theory is presented for the universal reduction of shot noise by Coulomb repulsion, which was observed in computer simulations of a disordered non-degenerate electron gas by Gonzalez et al. (cond-mat/9803372). The universality of the reduction below the uncorrelated value is explained as a feature of the high-voltage regime of space-charge limited conduction. The reduction factor depends on the dimensionality d of the density of states, being close but not quite equal to 1/d in two and three dimensions.