Jamming in systems with quenched disorder
Jamming in systems with quenched disorder
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DOI：
10.1103/physreve.86.061301
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发表时间：
2012-12-03
影响因子：
2.4
通讯作者：
Reichhardt, C.
中科院分区：
文献类型：
--
作者：
Reichhardt, C. J. Olson;Groopman, E.;Reichhardt, C.
我们用数值方法研究了以随机放置的钉扎位的形式加入猝灭无序对在清洁极限中一个明确定义的点J处卡住的圆盘堆积中阻塞相变的影响。猝灭的无序降低了干扰密度，并引入了脱钉阈值。在最低的钉扎密度下，有限阈值的开始与点J重合，但对于较高的钉扎密度，即使在远低于干扰的情况下，也总是存在有限的去钉扎阈值。我们发现，接近J点对输运曲线和噪声涨落有很大的影响，我们观察到了从干扰下的塑性行为到干扰上的弹性脱钉的变化。我们发现的许多一般特征与包含猝灭无序的其他系统有关，包括在涡旋系统中观察到的峰值效应。
We numerically study the effect of adding quenched disorder in the form of randomly placed pinning sites on jamming transitions in a disk packing that jams at a well-defined point J in the clean limit. Quenched disorder decreases the jamming density and introduces a depinning threshold. The onset of a finite threshold coincides with point J at the lowest pinning densities, but for higher pinning densities there is always a finite depinning threshold even well below jamming. We find that proximity to point J strongly affects the transport curves and noise fluctuations, and we observe a change from plastic behavior below jamming, where the system is highly heterogeneous, to elastic depinning above jamming. Many of the general features we find are related to other systems containing quenched disorder, including the peak effect observed in vortex systems.