Four-point susceptibility of a glass-forming binary mixture: Brownian dynamics

TL;DR

This paper investigates the four-point dynamic susceptibility in a glass-forming binary mixture using Brownian dynamics simulations, comparing results with mode-coupling theory and recent susceptibility estimates to understand glassy dynamics.

Contribution

It provides a detailed simulation analysis of four-point susceptibility in a binary mixture and tests theoretical predictions and recent estimation methods.

Findings

Simulation results align qualitatively with mode-coupling theory

The study evaluates the accuracy of a recent susceptibility estimate

Insights into dynamic heterogeneity in glass-forming systems

Abstract

We study the four-point dynamic susceptibility $\chi_4(t)$ obtained from Brownian dynamics computer simulations of the Kob-Andersen Lennard-Jones mixture. We compare the results of the simulations with qualitative predictions of the mode-coupling theory. In addition, we test an estimate of the four-point susceptibility recently proposed by Berthier \textit{et al.} [Science, \textbf{310}, 1797 (2005)].