Frozen Disorder in a Driven System

TL;DR

This paper studies how quenched disorder affects the universal behavior of a driven Ising lattice gas, revealing a new universality class with distinct critical properties and providing detailed scaling and critical exponent calculations.

Contribution

It identifies a new fixed point and universality class caused by quenched disorder in a driven system, expanding understanding of non-equilibrium critical phenomena.

Findings

Disorder destabilizes the pure system's fixed point.

A new fixed point governs the critical behavior with quenched disorder.

Critical exponents are calculated to two-loop order around d_c=5.

Abstract

We investigate the effects of quenched disorder on the universal properties of a randomly driven Ising lattice gas. The Hamiltonian fixed point of the pure system becomes unstable in the presence of a quenched local bias, giving rise to a new fixed point which controls a novel universality class. We determine the associated scaling forms of correlation and response functions, quoting critical exponents to two-loop order in an expansion around the upper critical dimension d$_c=5$.