Non-Gaussian nature of glassy dynamics by cage to cage motion

B. Vorselaars, A.V. Lyulin, K. Karatasos, M.A.J. Michels

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Abstract

A model based on a single Brownian particle moving in a periodic effective field is used to understand the non-Gaussian dynamics in glassy systems of cage escape and subsequent recaging, often thought to be caused by a heterogeneous glass structure. The results are compared to molecular-dynamics simulations of systems with varying complexity: quasi-two-dimensional colloidlike particles, atactic polystyrene, and a dendritic glass. The model nicely describes generic features of all three topologically different systems, in particular around the maximum of the non-Gaussian parameter. This maximum is a measure for the average distance between cages. [on SciFinder (R)]
Original languageEnglish
Article number011504
Pages (from-to)011504-1/16
Number of pages16
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume75
Issue number1
DOIs
Publication statusPublished - 2007

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