title: Nonequilibrium transport in quantum impurity models: the Bethe ansatz for open systems.
abstract: We develop an exact nonperturbative framework to compute steady-state properties of quantum impurities subject to a finite bias. We show that the steady-state physics of these systems is captured by nonequilibrium scattering eigenstates which satisfy an appropriate Lippman-Schwinger equation. Introducing a generalization of the equilibrium Bethe ansatz--the nonequilibrium Bethe ansatz--we explicitly construct the scattering eigenstates for the interacting resonance level model and derive exact, nonperturbative results for the steady-state properties of the system.
authors.affiliation: Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: Pankaj
authors.initials: P
authors.lastname: Mehta
authors.forename: Natan
authors.initials: N
authors.lastname: Andrei