Non-equilibrium phase transition in a two-temperature lattice gas

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Abstract

A two-temperature lattice gas model with repulsive nearest-neighbour interactions is studied using Monte Carlo simulations and dynamical mean-field approximations. The evolution of the two-dimensional, half-filled system is described by an anisotropic Kawasaki dynamics assuming that the hopping of particles along the principal directions is governed by two heat baths at different temperatures Tx and Ty. The system undergoes an order-disorder phase transition as Tx (Ty) is varied for sufficiently low fixed Ty (Tx). The non-equilibrium phase transition remains continuous and the critical behaviour belongs to the Ising universality class. The measure of violation of the fluctuation-dissipation theorem can be controlled by the value of the fixed temperature. We have found an exponential decay of spatial correlations above the critical region in contrast to the two-temperature model with attractive interactions.

Original languageEnglish
Pages (from-to)7791-7799
Number of pages9
JournalJournal of Physics A: Mathematical and General
Volume30
Issue number22
DOIs
Publication statusPublished - Nov 21 1997

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Physics and Astronomy(all)

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