Anisotropic ordering in a two-temperature lattice gas
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
We consider a two-dimensional lattice gas model with repulsive nearest- and next-nearest-neighbor interactions that evolves in time according to anisotropic Kawasaki dynamics. The hopping of particles along the principal directions is governed by two heat baths at different temperatures [formula presented] and [formula presented]. The stationary states of this nonequilibrium model are studied using a simple mean-field theory and linear stability analysis. The results are improved by a generalized dynamical mean-field approximation. In the stable ordered state the particles form parallel chains which are oriented along the direction of the higher temperature. In the resulting phase diagram in the [formula presented]-[formula presented] plane the critical temperature curve shows a weak maximum as a function of the parallel temperature which is confirmed by Monte Carlo simulations. Finite-size scaling analysis suggests that the model leaves the equilibrium universality class of the x-y model with cubic anisotropy and is described by the Ising exponents.
Originalsprog | Engelsk |
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Tidsskrift | Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics |
Vol/bind | 55 |
Udgave nummer | 3 |
Sider (fra-til) | 2255-2259 |
Antal sider | 5 |
ISSN | 1063-651X |
DOI | |
Status | Udgivet - 1 jan. 1997 |
ID: 236887562