Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-01-24
Physics
Condensed Matter
Statistical Mechanics
Improved data and analysis, new references
Scientific paper
10.1088/1742-5468/2007/05/P05003
We study driven particle systems with excluded volume interactions on a two-lane ladder with periodic boundaries, using Monte Carlo simulation, cluster mean-field theory, and numerical solution of the master equation. Particles in one lane are subject to a drive that forbids motion along one direction, while in the other lane the motion is unbiased; particles may jump between lanes. Despite the symmetry of the rates for transitions between lanes, the associated particle densities are unequal: at low densities there is an excess of particles in the undriven lane, while at higher densities the tendency is reversed. Similar results are found for an off-lattice model. We quantify the reduction in the stationary entropy caused by the drive. The stationary two-point correlation functions are found to decay algebraically, both on- and off-lattice. In the latter case the exponent governing the decay varies continuously with the density.
Dickman Ronald
Vidigal Ronaldo R.
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