Real-time simulations of nonequilibrium transport in the single-impurity Anderson model

TL;DR

This paper employs the adaptive tDMRG method to simulate real-time nonequilibrium transport in the single-impurity Anderson model, providing detailed current-voltage characteristics beyond linear response.

Contribution

It introduces a real-time simulation approach for nonequilibrium transport in the Anderson model, capturing Kondo and mixed-valence regimes with high accuracy.

Findings

Accurate current-voltage data for the Anderson model.

Insights into nonequilibrium transport beyond linear response.

Extension of simulations to mixed-valence regime.

Abstract

One of the main open problems in the field of transport in strongly interacting nanostructures is the understanding of currents beyond the linear response regime. In this work, we consider the single-impurity Anderson model and use the adaptive time-dependent density matrix renormalization group (tDMRG) method to compute real-time currents out of equilibrium. We first focus on the particle-hole symmetric point where Kondo correlations are the strongest and then extend the study of the nonequilibrium transport to the mixed-valence regime. As a main result, we present accurate data for the current-voltage characteristics of this model.