Aging Effects in a Lennard-Jones Glass

TL;DR

This study uses molecular dynamics simulations to analyze aging effects in a Lennard-Jones glass, revealing how out-of-equilibrium correlations depend on waiting time and temperature, and can be scaled onto a master curve.

Contribution

It demonstrates that the decay of dynamic correlations in a Lennard-Jones glass exhibits aging and can be scaled, providing insights into out-of-equilibrium behavior in glassy systems.

Findings

Correlation decay depends on waiting time (aging).

Decay curves can be scaled onto a master curve.

Aging behavior is influenced by pre-quench temperature.

Abstract

Using molecular dynamics simulations we study the out of equilibrium dynamic correlations in a model glass-forming liquid. The system is quenched from a high temperature to a temperature below its glass transition temperature and the decay of the two-time intermediate scattering function C(t_w,t+t_w) is monitored for several values of the waiting time t_w after the quench. We find that C(t_w,t+t_w) shows a strong dependence on the waiting time, i.e. aging, depends on the temperature before the quench and, similar to the case of spin glasses, can be scaled onto a master curve.