Emergence of coexisting ordered states in active matter systems
Emergence of coexisting ordered states in active matter systems
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DOI：
10.1126/science.aao5434
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发表时间：
2018-07-20
期刊：
影响因子：
56.9
通讯作者：
Bausch, A. R.
中科院分区：
文献类型：
--
作者：
Huber, L.;Suzuki, R.;Bausch, A. R.
主动系统比传统的平衡系统能产生更多种类的有序模式。特别是，无序和极性或向列相有序相之间的过渡已被预测和观察到的二维活性系统。然而，不同类型的顺序的阶段之间的共存还没有报道。我们证明了出现的动态共存的有序状态波动的极性和极性对称的肌动球蛋白运动测定。结合实验与基于代理的模拟，我们确定足够弱的相互作用，缺乏一个明确的对齐对称共存的先决条件。这样，宏观秩序的对称性就成为能动系统的一种突现的、动态的性质。这些结果提供了一种途径，通过这种途径，生命系统可以通过使用相同的构建模块来表达不同类型的秩序。
Active systems can produce a far greater variety of ordered patterns than conventional equilibrium systems. In particular, transitions between disorder and either polar-or nematically ordered phases have been predicted and observed in two-dimensional active systems. However, coexistence between phases of different types of order has not been reported. We demonstrate the emergence of dynamic coexistence of ordered states with fluctuating nematic and polar symmetry in an actomyosin motility assay. Combining experiments with agent-based simulations, we identify sufficiently weak interactions that lack a clear alignment symmetry as a prerequisite for coexistence. Thus, the symmetry of macroscopic order becomes an emergent and dynamic property of the active system. These results provide a pathway by which living systems can express different types of order by using identical building blocks.