Glassy dynamics: effective temperatures and intermittencies from a two-state model

TL;DR

This paper demonstrates intermittent dynamics in a simple two-state glassy model, linking theoretical predictions to experimental observations of effective temperature and fluctuation behaviors in glassy materials.

Contribution

It introduces a Langevin-based analysis of a two-state model revealing intermittent dynamics and non-Gaussian fluctuations, aligning with experimental findings.

Findings

Intermittent dynamics observed in the two-state model.

Qualitative agreement with experimental fluctuation measurements.

Method applicable to other slow relaxation systems.

Abstract

We show the existence of intermittent dynamics in one of the simplest model of a glassy system: the two-state model, which has been used to explain the origin of the violation of the fluctuation-dissipation theorem. The dynamics is analyzed through a Langevin equation for the evolution of the state of the system through its energy landscape. The results obtained concerning the violation factor and the non-Gaussian nature of the fluctuations are in good qualitative agreement with experiments measuring the effective temperature and the voltage fluctuations in gels and in polymer glasses. The method proposed can be useful to study the dynamics of other slow relaxation systems in which non-Gaussian fluctuations have been observed.