Electron-number statistics and shot-noise suppression by Coulomb correlation in nondegenerate ballistic transport

TL;DR

This paper uses Monte Carlo simulations to show that Coulomb interactions in ballistic electron transport induce motional squeezing and sub-Poissonian statistics, significantly reducing shot noise.

Contribution

It demonstrates the collective Coulomb correlation effects leading to shot noise suppression and motional squeezing in nondegenerate ballistic transport.

Findings

Electrons exhibit motional squeezing under Coulomb interaction.

Shot noise is suppressed by more than an order of magnitude.

Temporal correlations among electrons persist over transit.

Abstract

Within a Monte Carlo simulation we investigate the statistical properties of an electron flow injected with a Poissonian distribution and transmitted under ballistic regime in the presence of long-range Coulomb interaction. Electrons are shown to exhibit a motional squeezing which tends to space them more regularly rather than strictly at random, and evidence a sub-Poissonian statistics with a substantially reduced Fano factor $F_n\ll 1$. The temporal (anti)correlation among carriers is demonstrated to be a collective effect which persists over the transit of several successive electrons and results in a considerable (more than one order of magnitude) shot noise suppression.