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We consider a stochastic lattice gas with equal numbers of oppositely “charged” particles, diffusing under the influence of a uniform external “electric” field and the excluded-volume condition. Employing both Monte Carlo and analytic techniques, we discover a novel phase transition, controlled by particle density and field strength, separating a homogeneous phase from another with spatial inhomogeneities. We discuss the nature of this transition.
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Schmittmann et al. (1992) studied this question.
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