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arXiv 1608.04397cond-mat.soft
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存在淬火无序时驱动盘系统的动态相位、聚类和通道形成

Dynamic Phases, Clustering, and Lane Formation for Driven Disk Systems in the Presence of Quenched Disorder

Y. Yang, D. McDermott, C. J. Olson Reichhardt, C. Reichhardt

摘要:

我们数值研究了二维单分散排斥盘在随机淬火无序驱动下的动力学相和斑图形成。我们发现,有一系列不同的动态制度作为一个功能的增加驱动器,包括一个堵塞或堆积相附近脱钉,一个均匀的无序流动状态,和一个动态相分离制度组成的高密度的结晶区域包围的低密度的无序磁盘。在最高驱动器处,磁盘排列成一维移动通道。相分离的制度有平行的活性物质系统中观察到的相分离,并出现在磁盘系统由于非平衡涨落和密度相关的迁移率的组合。我们讨论了这个系统如何表现出显着的差异,从以前的研究驱动粒子移动随机基板的粒子,如超导涡旋或电子晶体,有较长的范围排斥相互作用,并在动态相分离和强的一维移动链效应没有观察到。我们考虑的系统可以通过实验实现,使用空间相互作用的胶体驱动随机钉扎阵列或准二维颗粒物质流过粗糙的景观。

英文摘要:

We numerically examine the dynamic phases and pattern formation of two-dimensional monodisperse repulsive disks driven over random quenched disorder. We show that there is a series of distinct dynamic regimes as a function of increasing drive, including a clogged or pile-up phase near depinning, a homogeneous disordered flow state, and a dynamically phase separated regime consisting of high density crystalline regions surrounded by a low density of disordered disks. At the highest drives the disks arrange into one-dimensional moving lanes. The phase separated regime has parallels with phase separation observed in active matter systems, and arises in the disk system due to the combination of nonequilibrium fluctuations and density dependent mobility. We discuss how this system exhibits pronounced differences from previous studies of driven particles moving over random substrates where the particles, such as superconducting vortices or electron crystals, have longer range repulsive interactions, and where dynamical phase separation and strong one-dimensional moving chain effects are not observed. The system we consider could be realized experimentally using sterically interacting colloids driven over random pinning arrays or quasi-two-dimensional granular matter flowing over rough landscapes.

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