Ke. Bassler et Z. Racz, BICRITICAL POINT AND CROSSOVER IN A 2-TEMPERATURE, DIFFUSIVE KINETIC ISING-MODEL, Physical review letters, 73(10), 1994, pp. 1320-1323
The phase diagram of a two-temperature kinetic Ising model which evolv
es by Kawasaki dynamics is studied using Monte Carlo simulations in di
mension d = 2 and solving a mean-spherical approximation in general d.
We show that the equal-temperature (equilibrium) Ising critical point
is a bicritical point where two nonequilibrium critical lines meet a
first-order line separating two distinct ordered phases. The shape of
the nonequilibrium critical lines is described by a crossover exponent
, phi, which we find to be equal to the susceptibility exponent, gamma
, of the Ising model.