Study of the Critical Behavior of the Driven Lattice Gas Model with Limited Nonequilibrium Dynamics

M. A. BAB; M L RUBIO PUZZO; G P SARACCO

Buenos Aires

Congreso; Fronteirs in Physical Sciences Humboldt Kolleg; 2016

Humboldt Kolleg

In this paper the nonequilibrium critical behavior is investigated using a variant of the well-known two-dimensional driven lattice gas (DLG) model, called modi ed driven lattice gas (MDLG). In this model, the application of the external eld is regulated by a parameter p ε [0,1] in such a way that if p=0, the eld is not applied, and it becomes the Ising model, while if p=1, the DLG model is recovered. The behavior of the model is investigated for several values of p by studying the dynamic evolution of the system within the short-time regime in the neighborhood of a phase transition. It is found that the system experiments second-order phase transitions in all the interval of p for the density of particles = 0.5. The determined critical temperaturesTc(p) are greater than the critical temperature of the Ising model Tc, and increase with p up to the critical temperature of the DLG model in the limit of in nite driving elds. The dependece of Tc(p) on p is compatible with a power-law behavior whose exponent is 0.27(3). Furthermore, the complete set of the critical and the anisotropic exponents is estimated. For the smallest value of p, the dynamic and exponents are close to that calculated for the Ising model, and the anisotropic exponent ∆ is near zero. As p is increased, the exponents and ∆ change,meaning that the anisotropy effects increase. For the largest value investigated, the set of exponents approaches to that reported by the most recent theoretical framework developed for the DLG model.