  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 heat baths at different temperatures. The stationary
states of this non-equilibrium model are studied using a generalized dynamical
mean-field analysis. In the stable state the particles form parallel chains
which are oriented along the direction of the higher temperature. The resulting
phase diagram is confirmed by Monte Carlo simulations
