Anisotropy and memory during cage breaking events close to a wall

Kohl M, Haertel A, Schmiedeberg M (2016)

Publication Status: Published

Publication Type: Journal article

Publication year: 2016

Journal

Journal of Physics: Condensed Matter Institute of Physics: Hybrid Open Access

Publisher: IOP PUBLISHING LTD

Book Volume: 28

Journal Issue: 50

DOI: 10.1088/0953-8984/28/50/505001

Abstract

The slow dynamics in a glassy hard-sphere system is dominated by cage breaking events, i.e. rearrangements where a particle escapes from the cage formed by its neighboring particles. We study such events for an overdamped colloidal system by the means of Brownian dynamics simulations. While it is difficult to relate cage breaking events to structural mean field results in bulk, we show that the microscopic dynamics of particles close to a wall can be related to the anisotropic two-particle density. In particular, we study cage-breaking trajectories, mean forces on a tracked particle, and the impact of the history of trajectories. Based on our simulation results, we further construct two different one-particle random-walk models-one without and one with memory incorporated-and find the local anisotropy and the history-dependence of particles as crucial ingredients to describe the escape from a cage. Finally, our detailed study of a rearrangement event close to a wall not only reveals the memory effect of cages, but leads to a deeper insight into the fundamental mechanisms of glassy dynamics.

Authors with CRIS profile

Michael Schmiedeberg Professur für Theoretische Physik

Involved external institutions

Heinrich-Heine-Universität Düsseldorf DE Germany (DE) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE)

How to cite

APA:

Kohl, M., Haertel, A., & Schmiedeberg, M. (2016). Anisotropy and memory during cage breaking events close to a wall. Journal of Physics: Condensed Matter, 28(50). https://doi.org/10.1088/0953-8984/28/50/505001

MLA:

Kohl, Matthias, Andreas Haertel, and Michael Schmiedeberg. "Anisotropy and memory during cage breaking events close to a wall." Journal of Physics: Condensed Matter 28.50 (2016).

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