DISCRETE QUANTUM MOTORS

We investigate dissipative quantum motion of a particle in a discrete periodic asymmetric lattice coupled to an Ohmic bath and subjected to a nonbiased oscillatory held. In the adiabatic forcing regime we find analytically external forcing rectification resulting in a motor mecha nism through persistent current creation. The direction and intensity of the motor operation is controlled by the competing mechanisms of di screteness induced Stark localization and phonon assisted ratchet delo calization. Maximal current of either sign is predicted at a parameter dependent characteristic temperature.