Anisotropy and memory during cage breaking events close to a wall

Anisotropy and memory during cage breaking events close to a wall
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靠近墙壁的笼子破裂事件中的各向异性和记忆

DOI:
10.1088/0953-8984/28/50/505001
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发表时间:
2016
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
M. Schmiedeberg
M. Schmiedeberg
中科院分区:
--
文献类型:
--
作者:
M. Kohl;A. Härtel;M. Schmiedeberg

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玻璃硬球系统中的缓慢动力学主要是由破笼事件,即一个粒子从其相邻粒子形成的笼中逃逸的重排。本文利用布朗动力学模拟方法研究了过阻尼胶体系统中的这类事件。虽然这是很难与笼打破事件的结构平均场结果散装,我们表明,靠近壁的颗粒的微观动力学可以与各向异性的两个粒子的密度。特别是,我们研究打破笼子的轨迹,平均力跟踪粒子,和轨迹的历史的影响。基于我们的模拟结果,我们进一步构建了两个不同的单粒子随机行走模型-一个没有,一个有记忆消除-并发现局部各向异性和历史依赖的粒子作为关键成分来描述逃离笼子。最后,我们对靠近墙壁的重排事件的详细研究不仅揭示了笼子的记忆效应,而且使我们对玻璃态动力学的基本机制有了更深入的了解。
The slow dynamics in a glassy hard-sphere system is dominated by cage breaking events, ie 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.
将软球体的玻璃动力学映射到硬球体行为
DOI: --
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期刊:
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靠近墙壁的硬球多组分流体。
DOI: --
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