Fluctuation Theorem in Driven Nonthermal Systems with Quenched Disorder

TL;DR

This paper applies the fluctuation theorem to driven nonthermal systems with quenched disorder, revealing its broader applicability in characterizing nonequilibrium dynamics near depinning transitions.

Contribution

It demonstrates that the fluctuation theorem can be used to analyze the dynamics of nonthermal systems with quenched disorder, extending its applicability beyond thermal systems.

Findings

The fluctuation theorem holds near depinning regimes in these systems.

Entropy-destroying trajectories are key to characterizing dynamical regimes.

The approach can be tested in systems like vortices, magnetic domain walls, and dislocations.

Abstract

We demonstrate that the fluctuation theorem of Gallavotti and Cohen can be used to characterize the class of dynamics that arises in nonthermal systems of collectively interacting particles driven over random quenched disorder. By observing the frequency of entropy-destroying trajectories, we show that there are specific dynamical regimes near depinning in which this theorem holds. Hence the fluctuation theorem can be used to characterize a significantly wider class of nonequilibrium systems than previously considered. We discuss how the fluctuation theorem could be tested in specific systems where noisy dynamics appear at the transition from a pinned to a moving phase such as in vortices in type-II superconductors, magnetic domain walls, and dislocation dynamics.