NONLINEAR MOBILITY OF PARTICLES IN NONSYMMETRIC POTENTIALS UNDER STRONG BIAS CONDITIONS

The hopping mobility of particles on discrete linear chains is conside red, when an arbitrary bias acts on the particles. An exact expression for the stationary current is given in terms of the site energies and the transition rates between the sites, and verified by numerical sim ulations. The mobility exhibits rectification effects in the regime of nonlinear response, if the sit energies and barriers correspond to no nsymmetric potentials. Possible extensions to two- and three-dimension al systems are dicussed.