Quasiparticle excitations in steady state transport across a correlated layer

TL;DR

This paper studies how quasiparticle excitations affect transport in a correlated layer connected to metallic leads under bias, revealing quantum dot-like current-voltage behavior and spectral splitting at finite temperature.

Contribution

It extends previous models by including nonzero temperature in leads, providing detailed insights into quasiparticle effects on steady state transport in correlated systems.

Findings

Current-voltage curves resemble quantum dot behavior

Spectral function shows quasiparticle splitting with bias

Finite temperature influences quasiparticle excitations

Abstract

In this work we investigate the spectral and transport properties of a single correlated layer attached to two metallic leads, with particular focus on the low-energy physics. A steady state current is driven across the layer by applying a bias voltage between the leads. Extending previous work we introduce a nonzero temperature in the leads, which enables us to study the influence of quasiparticle excitations on the transport characteristics in detail. Even though the system is clearly three dimensional we obtain current-voltage curves that closely resemble those of single quantum dots. Furthermore, a splitting of the quasiparticle excitation with bias voltage is observed in the spectral function.