Abstract
Condensation occurs in nonequilibrium steady states when a finite fraction of the particlesin the system occupies a single lattice site. We study condensation transitions in aone-dimensional zero-range process with a single defect site. The system is analysed in thegrand canonical and canonical ensembles and the two are contrasted. Two distinctcondensation mechanisms are found in the grand canonical ensemble. Discrepanciesbetween the infinite and large but finite systems’ particle current versus particle densitydiagrams are investigated and an explanation for how the finite current goes above amaximum value predicted for infinite systems is found in the canonical ensemble.
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