Phase separation and emergent structures in an active nematic fluid.
Phase separation and emergent structures in an active nematic fluid.
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DOI：
10.1103/physreve.90.042304
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发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
Baskaran A
中科院分区：
文献类型：
--
作者：
Putzig E;Baskaran A
我们考虑了活性向列流体的唯象连续介质理论，并表明存在一种普遍的、与模型无关的不稳定性，使得均匀向列状态对有序波动不稳定。使用数值和分析工具，我们表明，在临界点附近，这种不稳定性导致相分离状态，其中有序区域形成带，其中向列有序方向垂直于密度梯度方向。我们认为，导致这种相分离的根本机制是不同对称性的活性流体的普遍特征。
We consider a phenomenological continuum theory for an active nematic fluid and show that there exists a universal, model independent instability which renders the homogeneous nematic state unstable to order fluctuations. Using numerical and analytic tools we show that, in the vicinity of a critical point, this instability leads to a phase separated state in which the ordered regions form bands in which the direction of nematic order is perpendicular to the direction of density gradient. We argue that the underlying mechanism that leads to this phase separation is a universal feature of active fluids of different symmetries.