Nonequilibrium dual-boson approach

TL;DR

The paper introduces a nonequilibrium auxiliary dual-boson method for accurately modeling steady states in correlated impurity systems, balancing computational efficiency and precision.

Contribution

It presents a new auxiliary dual-boson approach for nonequilibrium impurity models, enabling efficient and accurate steady-state simulations.

Findings

High accuracy in steady-state predictions

Low computational cost compared to existing methods

Successful benchmarking against exact results

Abstract

We develop nonequilibrium auxiliary quantum master equation dual boson method (aux-DB), and argue that it presents a convenient way to describe steady states of correlated impurity models (such as single molecule optoelectronic devices) where electron and energy transport should be taken into account. The aux-DB is shown to provide high accuracy with relatively low numerical cost. Theoretical analysis is followed by illustrative simulations within generic two-level junction model, where the new scheme is benchmarked against numerically exact results.