Study of the critical behavior of the driven lattice gas model with limited nonequilibrium dynamics

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

PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2017 vol. 467 p. 307 - 312

0378-4371

In this paper the nonequilibrium critical behavior is investigated using a variant of the well-known two-dimensional driven lattice gas (DLG) model, called modified driven lattice gas (MDLG). In this model, the application of the external field is regulated by a parameter pϵ[0,1] in such a way that if p=0, the field 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 ρ=0.5. The determined critical temperatures Tc(p) are greater than the critical temperature of the Ising model View the MathML source, and increase with p up to the critical temperature of the DLG model in the limit of infinite driving fields. The dependece of Tc(p) on p is compatible with a power-law behavior whose exponent is ψ=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 β exponents are close to that calculated for the Ising model, and the anisotropic exponent Δ is near zero. As p is increased, the exponents and Δ 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.