title: Nonequilibrium stationary states with ratchet effect.
abstract: An ensemble of particles in thermal equilibrium at temperature T, modeled by Nosè-Hoover dynamics, moves on a triangular lattice of oriented semidisk elastic scatterers. Despite the scatterer asymmetry, a directed transport is clearly ruled out by the second law of thermodynamics. Introduction of a polarized zero mean monochromatic field creates a directed stationary flow with nontrivial dependence on temperature and field parameters. We give a theoretical estimate of directed current induced by a microwave field in an antidot superlattice in semiconductor heterostructures.
authors.affiliation: Center for Nonlinear and Complex Systems, Dipartimento di Scienze Chimiche, Fisiche e Matematiche, Università dell'Insubria, Via Valleggio 11, Unità di Como, 22100 Como, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Cristadoro
authors.forename: D L
authors.initials: DL
authors.lastname: Shepelyansky