title: Non-Gaussian nature of glassy dynamics by cage to cage motion.
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.
authors.affiliation: Group Polymer Physics, Eindhoven Polymer Laboratories and Dutch Polymer Institute, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands. vorselaars@tue.nl
authors.forename: Bart
authors.initials: B
authors.lastname: Vorselaars
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Lyulin
authors.forename: K
authors.initials: K
authors.lastname: Karatasos
authors.forename: M A J
authors.initials: MA
authors.lastname: Michels