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arXiv · 1004.4738

Aging effects manifested in the potential energy landscape of a model glass former

Christian Rehwald·Nicoletta Gnan·Andreas Heuer·Thomas Schrøder·Jeppe C. Dyre·Gregor Diezemann
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Abstract

We present molecular dynamics simulations of a model glass-forming liquid (the binary Kob-Anderson Lennard-Jones model) and consider the distributions of inherent energies and metabasins during aging. In addition to the typical protocol of performing a temperature jump from a high temperature to a low destination temperature, we consider the temporal evolution of the distributions after an 'up-jump', i.e. from a low to a high temperature. In this case the distribution of megabasin energies exhibits a transient two-peak structure. Our results can qualitatively be rationalized in terms of a trap model with a Gaussian distribution of trap energies. The analysis is performed for different system sizes. A detailed comparison with the trap model is possible only for a small system because of major averging effects for larger systems.

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Christian Rehwald, Nicoletta Gnan, Andreas Heuer, Thomas Schrøder, Jeppe C. Dyre, Gregor Diezemann. 2010-04-27. Aging effects manifested in the potential energy landscape of a model glass former. https://doi.org/10.1103/physreve.82.021503

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