We study driven particle systems with excluded volume interactions on atwo-lane ladder with periodic boundaries, using Monte Carlo simulation, clustermean-field theory, and numerical solution of the master equation. Particles inone lane are subject to a drive that forbids motion along one direction, whilein the other lane the motion is unbiased; particles may jump between lanes.Despite the symmetry of the rates for transitions between lanes, the associatedparticle densities are unequal: at low densities there is an excess ofparticles in the undriven lane, while at higher densities the tendency isreversed. Similar results are found for an off-lattice model. We quantify thereduction in the stationary entropy caused by the drive. The stationarytwo-point correlation functions are found to decay algebraically, both on- andoff-lattice. In the latter case the exponent governing the decay variescontinuously with the density.
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