Transport through a quantum dot with excitonic dot-lead coupling

TL;DR

This paper investigates how excitonic dot-lead interactions influence electron transport in a quantum dot connected to Luttinger-liquid leads, revealing an enhancement of conductance near the Coulomb blockade threshold.

Contribution

It introduces a bosonization approach to analyze excitonic interactions and demonstrates their impact on transport properties in quantum dot systems.

Findings

Excitonic dot-lead coupling enhances transport near Coulomb blockade threshold.

Contrasts with usual power-law suppression of tunneling without this interaction.

Provides a new perspective on controlling quantum dot conductance.

Abstract

We study the effect of a dot-lead interaction on transport through a quantum dot hybridized to two semi-infinite Luttinger-liquid leads. A bosonization approach is applied to treat the interaction between charge fluctuations on the dot and the dynamically generated image charge in the leads. The nonequilibrium distribution function of the dot and the tunneling current are computed within a master-equation approach. The presence of the excitonic dot-lead coupling is found to enhance transport in the vicinity of the Coulomb-blockade threshold. This behavior is in contrast to the usual power-law suppression of electronic tunneling which is found if this interaction is ignored.