Vibrated polar disks: spontaneous motion, binary collisions, and collective dynamics
Vibrated polar disks: spontaneous motion, binary collisions, and collective dynamics
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DOI：
10.1039/c2sm25186h
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发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Chate, Hugues
中科院分区：
文献类型：
--
作者：
Deseigne, Julien;Leonard, Sebastien;Chate, Hugues
我们研究了“极盘”的自发运动、二元碰撞和集体动力学，“极盘”是指特别设计的粒子，当它们在两个水平板之间振动时，沿着沿着与其内在极性强烈相关的方向相干地运动。我们的粒子的运动，虽然名义上是三维的和复杂的，是很好地占了一个二维的持续随机行走。它们的二元碰撞是时空扩展事件，在此期间发生多个实际碰撞，产生弱平均有效对齐。我们表明，这种良好的控制，“干活性物质”系统可以显示集体运动的顺序系统大小的定向有序区域。我们提供的证据表明，在最有序的制度观察到的强大的数密度波动。这些结果进行了讨论，在我们的系统的局限性，特别是那些由于不可避免的存在的墙壁。
We study the spontaneous motion, binary collisions, and collective dynamics of "polar disks'', i.e. specially designed particles which, when vibrated between two horizontal plates, move coherently along a direction strongly correlated to their intrinsic polarity. The motion of our particles, although nominally three-dimensional and complicated, is well accounted for by a two-dimensional persistent random walk. Their binary collisions are spatiotemporally extended events during which multiple actual collisions happen, yielding a weak average effective alignment. We show that this well-controlled, "dry active matter'' system can display collective motion with orientationally-ordered regions of the order of the system size. We provide evidence of strong number density fluctuations in the most ordered regimes observed. These results are discussed in the light of the limitations of our system, notably those due to the inevitable presence of walls.