Volume 46, Number 5, June I 1999
|Page(s)||637 - 642|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Fluctuation-dissipation ratio in an aging Lennard-Jones glass
Département de Physique des Matériaux,
Université Claude Bernard and CNRS
69622 Villeurbanne Cedex, France
2 Institut für Physik, Johannes Gutenberg-Universität Staudinger Weg 7, D-55099 Mainz, Germany
Accepted: 18 March 1999
By using extensive molecular dynamics simulations, we have determined the violation of the fluctuation-dissipation theorem in a Lennard-Jones liquid quenched to low temperatures. For this we have calculated X(C), the ratio between a one-particle time-correlation function C and the associated response function. Our results are best fitted by assuming that X(C) is a discontinuous, piecewise constant function. This is similar to what is found in spin systems with one-step replica symmetry breaking. This strengthens the conjecture of a similarity between the phase space structure of structural glasses and such spin systems.
PACS: 61.43.Fs – Glasses / 61.20.Lc – Structure of liquids: Time-dependent properties; relaxation / 02.70.Ns – Molecular dynamics and particle methods
© EDP Sciences, 1999
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