Nonperturbative Dynamical Theory and A Scheme for Nonequilibrium Transport

TL;DR

This paper introduces a nonperturbative dynamical theory for analyzing nonequilibrium transport in strongly correlated systems, validated against established methods and extended to Kondo systems.

Contribution

It presents a novel nonperturbative dynamical theory for nonequilibrium transport and proposes a self-consistent scheme for current calculation in Kondo systems.

Findings

NDT agrees with NRG results for equilibrium Anderson model

The theory effectively handles strong correlations in nonequilibrium

A self-consistent loop for current calculation is proposed

Abstract

We develop a nonperturbative dynamical theory (NDT) that is useful for treating nonequilibrium transport in a system with strong correlation. We apply our NDT to the single-impurity Anderson model in equilibrium to check its reliability by comparing with the results of numerical renormalization group method (NRG). We finally suggest a self-consistent loop to calculate the current in a lead-dot-lead system with Kondo coupling.