Dynamical Correlation Length and Relaxation Processes in a Glass Former

TL;DR

This paper studies the relaxation and dynamical heterogeneities in a lattice glass model, linking relaxation timescales to a reverse-percolation transition through a geometrical perspective.

Contribution

It introduces a geometrical interpretation of relaxation processes in a kinetically constrained glass model, connecting timescales to a reverse-percolation transition.

Findings

Relaxation and heterogeneities are characterized by different timescales.

The diffusing defect paradigm effectively describes the dynamics.

Relaxation is related to a reverse-percolation transition.

Abstract

We investigate the relaxation process and the dynamical heterogeneities of the kinetically constrained Kob--Anderson lattice glass model, and show that these are characterized by different timescales. The dynamics is well described within the diffusing defect paradigm, which suggest to relate the relaxation process to a reverse--percolation transition. This allows for a geometrical interpretation of the relaxation process, and of the different timescales.