光盘驱动磁盘系统的速度力曲线、航线和干扰
Velocity Force Curves, Laning, and Jamming for Oppositely Driven Disk Systems
摘要：
使用模拟，我们研究了一个二维磁盘系统中，两个磁盘物种被驱动在相反的方向。我们测量的平均速度的一个物种与所施加的驱动力，并确定四个阶段的驱动器和磁盘密度的函数：堵塞状态，一个完全相分离的状态，连续混合相，和一个laning阶段。这些阶段之间的过渡与速度-力曲线的跳跃相关，这与在具有淬火无序的驱动粒子系统（如II型超导体中的涡旋）中的动态相变中观察到的行为相似。在某些情况下，相之间的过渡与负微分迁移率相关，其中任一种物质的平均绝对速度随着驱动力的增加而降低。我们还考虑的情况下，驱动器被施加到只有一个物种，以及系统中，两个物种被驱动在同一方向上，不同的驱动幅度。最后，我们讨论了如何过渡，我们观察到的吸收相变，其中一个系统在一个阶段分离或laning制度组织到一个状态，其中磁盘之间的接触不再发生和动力学波动丢失。
英文摘要：
Using simulations we examine a two-dimensional disk system in which two disk species are driven in opposite directions. We measure the average velocity of one of the species versus the applied driving force and identify four phases as function of drive and disk density: a jammed state, a completely phase separated state, a continuously mixing phase, and a laning phase. The transitions between these phases are correlated with jumps in the velocity-force curves that are similar to the behavior observed at dynamical phase transitions in driven particle systems with quenched disorder such as vortices in type-II superconductors. In some cases the transitions between phases are associated with negative differential mobility in which the average absolute velocity of either species decreases with increasing drive. We also consider the situation where the drive is applied to only one species as well as systems in which both species are driven in the same direction with different drive amplitudes. Finally, we discuss how the transitions we observe could be related to absorbing phase transitions where a system in a phase separated or laning regime organizes to a state in which contacts between the disks no longer occur and dynamical fluctuations are lost.
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