多分散颗粒体系的无序相变和峰效应
Disordering Transitions and Peak Effect in Polydisperse Particle Systems
摘要：
我们数值计算表明，在一个二元系统的汤川粒子，分散性驱动的无序转变发生。在存在淬火无序的情况下，这种无序转变与脱钉阈值的显著增加相一致，称为峰值效应。我们发现，除了不良钉扎粒子可以增加整体钉扎在样品中，通过增加的拓扑无序存在的量。如果淬火无序足够强以在单分散体系中产生显著量的拓扑无序，则添加不良钉扎物质产生进一步的无序，但不产生脱钉扎力的峰值。我们的研究结果表明，对于二元混合物，最佳钉扎拓扑缺陷分数密度为0.2至0.25。对于低于这个范围的缺陷密度，系统保持取向顺序。我们确定的钉扎密度，强度和半径上的脱钉峰的效果，并发现峰值效应是在弱钉扎系统更明显。
英文摘要：
We show numerically that in a binary system of Yukawa particles, a dispersity driven disordering transition occurs. In the presence of quenched disorder this disordering transition coincides with a marked increase in the depinning threshold, known as a peak effect. We find that the addition of poorly pinned particles can increase the overall pinning in the sample by increasing the amount of topological disorder present. If the quenched disorder is strong enough to create a significant amount of topological disorder in the monodisperse system, addition of a poorly pinned species generates further disorder but does not produce a peak in the depinning force. Our results indicate that for binary mixtures, optimal pinning occurs for topological defect fraction densities of 0.2 to 0.25. For defect densities below this range, the system retains orientational order. We determine the effect of the pinning density, strength, and radius on the depinning peak and find that the peak effect is more pronounced in weakly pinning systems.
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