Emergent Collective Phenomena in a Mixture of Hard Shapes through Active Rotation
Emergent Collective Phenomena in a Mixture of Hard Shapes through Active Rotation
复制标题
DOI：
10.1103/physrevlett.112.075701
复制
发表时间：
2014-02-20
影响因子：
8.6
通讯作者：
Glotzer, Sharon C.
中科院分区：
文献类型：
--
作者：
Nguyen, Nguyen H. P.;Klotsa, Daphne;Glotzer, Sharon C.
我们用旋转驱动的凹形旋转器研究集体现象。每个旋转器都会沿顺时针或逆时针方向经历恒定的内部扭矩。尽管旋转器被建模为坚硬的、非相互作用的刚体，但它们的主动运动会产生有效的相互作用，有利于沿同一方向旋转。随着密度和活性的增加，通过旋节线分解发生相分离，并自组织成旋转晶体。我们观察到沿着界面出现协作的超扩散运动，它可以传输不活跃的测试粒子。我们的结果证明了主动旋转颗粒的新颖相行为，这是线性推进或相同硬颗粒的非驱动平衡系统中不可能实现的。
We investigate collective phenomena with rotationally driven spinners of concave shape. Each spinner experiences a constant internal torque in either a clockwise or counterclockwise direction. Although the spinners are modeled as hard, otherwise noninteracting rigid bodies, their active motion induces an effective interaction that favors rotation in the same direction. With increasing density and activity, phase separation occurs via spinodal decomposition, as well as self-organization into rotating crystals. We observe the emergence of cooperative, superdiffusive motion along interfaces, which can transport inactive test particles. Our results demonstrate novel phase behavior of actively rotated particles that is not possible with linear propulsion or in nondriven, equilibrium systems of identical hard particles.