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

Vorselaars, Bart, Lyulin, Alexey V., Karatasos, K. and Michels, M. A. J. (2007) Non-Gaussian nature of glassy dynamics by cage to cage motion. Physical Review E, 75 (1). ISSN 1539-3755

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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.

Keywords:glass cage, Glass transition, non-gaussian behaviour, hopping, molecular dynamics
Subjects:F Physical Sciences > F300 Physics
J Technologies > J300 Ceramics and Glasses
F Physical Sciences > F320 Chemical Physics
H Engineering > H310 Dynamics
F Physical Sciences > F310 Applied Physics
Divisions:College of Science > School of Mathematics and Physics
ID Code:18234
Deposited On:05 Aug 2015 15:56

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