AI Article Synopsis
- The study uses event-driven simulations and experiments to examine how single-particle movements and correlations in hard-sphere glasses change when shear is applied, focusing on packing fractions above the glass transition.
- As the shear rate decreases, correlations between particles increase, resulting in a broader range of particle movements.
- However, decreasing the packing fraction also broadens the range of movements but leads to less dynamic heterogeneity, suggesting a complex interaction between shear forces and thermal fluctuations.
- The research also aims to clarify the anisotropy of these dynamic correlations.
Article 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. 100, 56001 (2012)], we further address the issue of anisotropy of the dynamic correlations.
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| http://dx.doi.org/10.1103/PhysRevE.88.022129 | DOI Listing |
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