Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-11-03
AIP Conf. Proc. 1091, 95 (2009)
Physics
Condensed Matter
Soft Condensed Matter
Paper presented at the 10th Granada Conference on Computational and Statistical physics
Scientific paper
10.1063/1.3082338
We discuss the relaxation dynamics of a simple lattice gas model for glass-forming systems and show that with increasing density of particles this dynamics slows down very quickly. By monitoring the trajectory of tagged particles we find that their motion is very heterogeneous in space and time, leading to regions in space in which there is a fast dynamics and others in which it is slow. We determine how the geometric properties of these quickly relaxing regions depend on density and time. Motivated by this heterogeneous hopping dynamics, we use a simple model, a variant of a continuous time random walk, to characterize the relaxation dynamics. In particular we find from this model that for large displacements the self part of the van Hove function shows an exponential tail, in agreement with recent findings from experiments and simulations of glass-forming systems.
Berthier Ludovic
Chaudhuri Pinaki
Kob Walter
Sastry Srikanth
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