  A two-dimensional half-filled lattice gas model with nearest-neighbor
attractive interaction is studied where particles are coupled to two thermal
baths at different temperatures $T_1$ and $T_2$. The hopping of particles is
governed by the heat bath at temperature $T_1$ with probability $p$ and the
other heat bath $(T_2)$ with probability $1-p$ independently of the hopping
direction. On a square lattice the vertical and horizontal interfaces become
unstable while interfaces are stable in the diagonal directions. As a
consequence, particles condense into a tilted square in the novel ordered
state. The $p$-dependence of the resulting nonequilibrium stationary state is
studied by Monte Carlo simulation and dynamical mean-field approximation as
well.
