Single particle fluctuations and directional correlations in driven hard sphere glasses
Abstract
Via event driven molecular dynamics simulations and experiments, we study the packing fraction and shear-rate dependence of single particle fluctuations and dynamic correlations in hard sphere glasses under shear. At packing fractions above the glass transition, correlations increase as shear rate decreases: the exponential tail in the distribution of single particle jumps broadens and dynamic four-point correlations increase. Interestingly, however, upon decreasing the packing fraction, a broadening of the exponential tail is also observed, while dynamic heterogeneity is shown to decrease. An explanation for this behavior is proposed in terms of a competition between shear and thermal fluctuations. Building upon our previous studies [Chikkadi et al, Europhys. Lett. (2012)], we further address the issue of anisotropy of the dynamic correlations.
Cite
@article{arxiv.1305.3047,
title = {Single particle fluctuations and directional correlations in driven hard sphere glasses},
author = {Suvendu Mandal and Vijaykumar Chikkadi and Bernard Nienhuis and Dierk Raabe and Peter Schall and Fathollah Varnik},
journal= {arXiv preprint arXiv:1305.3047},
year = {2015}
}
Comments
8 pages, 10 figures