title: Directed transport by pumping of excited states.
abstract: We present the exact analytic solution for the model of directed transport induced by nonequilibrium state occupation, introduced by Porto [Eur. Phys. J. B 25, 345 (2002)].
authors.affiliation: Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium.
authors.forename: B
authors.initials: B
authors.lastname: Cleuren
authors.forename: C
authors.initials: C
authors.lastname: Van den Broeck