Non-equilibrium relaxation and critical aging for driven Ising lattice gases

TL;DR

This study uses Monte Carlo simulations to analyze non-equilibrium relaxation and aging phenomena in driven two-dimensional Ising lattice gases, confirming theoretical predictions and accurately determining critical exponents.

Contribution

It introduces a method to precisely measure critical exponents from aging scaling, improving understanding of non-equilibrium dynamics in driven lattice gases.

Findings

Aging scaling accurately yields critical exponents.

Excellent agreement with renormalization group predictions.

Density auto-correlation scaling in steady state is less precise.

Abstract

We employ Monte Carlo simulations to study the non-equilibrium relaxation of driven Ising lattice gases in two dimensions. Whereas the temporal scaling of the density auto-correlation function in the non-equilibrium steady state does not allow a precise measurement of the critical exponents, these can be accurately determined from the aging scaling of the two-time auto-correlations and the order parameter evolution following a quench to the critical point. We obtain excellent agreement with renormalization group predictions based on the standard Langevin representation of driven Ising lattice gases.