Dresden 2014 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 43: Focus session: Slow Dynamics in Glasses and Granular Matter II (joint session DY/ CPP/ DF)
DY 43.3: Talk
Friday, April 4, 2014, 10:15–10:30, HÜL 186
Correlations and response in sheared hard sphere glasses — •Suvendu Mandal1, Dierk Raabe1, and Fathollah Varnik2 — 1Max-Planck Institut für Eisenforschung, Max-Planck Str. 1, 40237 Düsseldorf, Germany — 2Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr University Bochum, Universitätsstr. 150, 44801 Bochum, Germany
Via event-driven molecular dynamics simulations, we study the packing-fraction and shear-rate dependence of single-particle fluctuations and dynamic correlations in hard-sphere glasses under shear [1]. 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. We further address the issue of anisotropy of the dynamic correlations [2,3].
[1] Suvendu Mandal, Markus Gross, Dierk Raabe, and Fathollah Varnik, PRL. 108, 098301 (2012). [2] Suvendu Mandal, Vijaykumar Chikkadi, Bernard Nienhuis, Dierk Raabe, Peter Schall, and Fathollah Varnik, PRE. 88, 022129 (2013). [3] Vijaykumar Chikkadi, Suvendu Mandal, Bernard Nienhuis, Dierk Raabe, Peter Schall, and Fathollah Varnik, EPL. 100, 56001 (2012).