Non-linear quantum noise effects in scale invariant junctions

TL;DR

This paper investigates non-linear effects on particle and heat noise in scale invariant quantum junctions, revealing noise enhancement and reduction domains, and highlighting differences between bosonic and fermionic statistics.

Contribution

It introduces an analysis of non-linear particle current effects on noise in scale invariant quantum junctions, including multi-lead setups and statistical impacts.

Findings

Non-linear particle current influences both particle and heat noise.

Domains of noise enhancement and reduction are identified.

Bosonic noise exceeds fermionic noise under certain conditions.

Abstract

We study non-equilibrium steady state transport in scale invariant quantum junctions with focus on the particle and heat fluctuations captured by the two-point current correlation functions. We show that the non-linear behavior of the particle current affects both the particle and heat noise. The existence of domains of enhancement and reduction of the noise power with respect to the linear regime are observed. The impact of the statistics is explored. We demonstrate that in the scale invariant case the bosonic particle noise exceeds the fermionic one in the common domain of heat bath parameters. Multi-lead configurations are also investigated and the effect of probe terminals on the noise is discussed.