Aging in a simple glassformer
Abstract
Using molecular dynamics computer simulations we investigate the out-of-equilibrium dynamics of a Lennard-Jones system after a quench from a high temperature to one below the glass transition temperature. By studying the radial distribution function we give evidence that during the aging the system is very close to the critical surface of mode-coupling theory. Furthermore we show that two-time correlation functions show a strong dependence on the waiting time since the quench and that their shape is very different from the one in equilibrium. By investigating the temperature and time dependence of the frequency distribution of the normal modes we show that the energy of the inherent structures can be used to define an effective (time dependent) temperature of the aging system.
Cite
@article{arxiv.cond-mat/9910476,
title = {Aging in a simple glassformer},
author = {Walter Kob and Jean-Louis Barrat and Francesco Sciortino and Piero Tartaglia},
journal= {arXiv preprint arXiv:cond-mat/9910476},
year = {2009}
}
Comments
Talk presented at ``Unifying Concepts in Glass Physics'', ICTP, Trieste 15 - 18 September 1999; 12 pages of Latex