Simulations of driven and reconstituting lattice gases

TL;DR

This paper investigates the stationary behavior of driven lattice gases with extended particles, revealing how interactions influence steady states, phase space structure, and correlations, with evidence of an order-by-disorder transition in repulsive cases.

Contribution

It introduces a detailed analysis of driven lattice gases with extended particles, highlighting the sector decomposition of phase space and the effects of attractive versus repulsive interactions on steady states.

Findings

Steady state currents and correlations vary significantly with interaction type.

Phase space breaks into many disconnected sectors labeled by irreducible strings.

An order-by-disorder transition is suggested for repulsive interactions.

Abstract

We discuss stationary aspects of a set of driven lattice gases in which hard-core particles with spatial extent, covering more than one lattice site, diffuse and reconstruct in one dimension under nearest-neighbor interactions. As in the uncoupled case [M. Barma et al., J. Phys. Condens. Matter 19, 065112 (2007)], the dynamics of the phase space breaks up into an exponentially large number of mutually disconnected sectors labeled by a non-local construct, the irreducible string. Depending on whether the particle couplings are taken attractive or repulsive, simulations in most of the studied sectors show that both steady state currents and pair correlations behave quite differently at low temperature regimes. For repulsive interactions an order-by-disorder transition is suggested.