Effect of long-range Coulomb interaction on shot-noise suppression in ballistic transport

TL;DR

This paper investigates how long-range Coulomb interactions influence shot-noise suppression in ballistic semiconductor devices, revealing a scaling relationship with the Debye length across various injection densities.

Contribution

It provides a microscopic analysis using Monte Carlo simulations coupled with Poisson equations to understand shot-noise suppression mechanisms.

Findings

Shot-noise suppression increases with injection density.

Suppression scales with a dimensionless Debye length.

Space-charge effects are crucial in noise behavior.

Abstract

We present a microscopic analysis of shot-noise suppression due to long-range Coulomb interaction in semiconductor devices under ballistic transport conditions. An ensemble Monte Carlo simulator self-consistently coupled with a Poisson solver is used for the calculations. A wide range of injection-rate densities leading to different degrees of suppression is investigated. A sharp tendency of noise suppression at increasing injection densities is found to scale with a dimensionless Debye length related to the importance of space-charge effects in the structure.