Nonequilibrium dual-boson approach

We develop a 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 junction models, where the scheme is benchmarked against numerically exact results.