Nonequilibrium plasmons and transport properties of a double--junction quantum wire

TL;DR

This paper investigates how non-equilibrium plasmons influence transport properties like current, noise, and statistics in a double-junction quantum wire modeled as Luttinger liquids, revealing significant effects under strong interactions.

Contribution

It provides a theoretical analysis of non-equilibrium plasmons' impact on transport in a double-junction quantum wire using a master equation approach, highlighting strong interaction effects.

Findings

Non-equilibrium plasmons increase average current.

Shot noise is enhanced and super-Poissonian.

Strong interactions amplify these effects.

Abstract

We study theoretically the current-voltage characteristics, shot noise, and full counting statistics of a quantum wire double barrier structure. We model each wire segment by a spinless Luttinger liquid. Within the sequential tunneling approach, we describe the system's dynamics using a master equation. We show that at finite bias the non-equilibrium distribution of plasmons in the central wire segment leads to increased average current, enhanced shot noise, and full counting statistics corresponding to a super-Poissonian process. These effects are particularly pronounced in the strong interaction regime, while in the non-interacting case we recover results obtained earlier using detailed balance arguments.