Dynamics of a rod in a random static environment: non-Gaussianity at large length scales
Soft Condensed Matter
2007-05-23 v1 Disordered Systems and Neural Networks
Abstract
We present molecular dynamics simulations of the motion of a single rod in a two-dimensional random static array of disks. For long rods the mean-squared displacement of the center-of-mass shows a cage effect similar to that observed in supercooled liquids or dense colloidal systems. We have determined the time-dependence of the non-Gaussian parameter for different rod lengths. It is found that the long-time regime is strongly non-Gaussian even at length scales of the order of 10-15 times the rod length, thus showing the heterogeneity of the dynamics at such length scales.
Cite
@article{arxiv.cond-mat/0303510,
title = {Dynamics of a rod in a random static environment: non-Gaussianity at large length scales},
author = {A. J. Moreno and W. Kob},
journal= {arXiv preprint arXiv:cond-mat/0303510},
year = {2007}
}
Comments
7 pages, 3 figures. Submitted to Philosophical Magazine B. Proceedings of the 9th International Workshop on Disordered Systems, 10-13 March 2003, Molveno-Trento (Italy)