Dynamically generated patterns in dense suspensions of active filaments.
Dynamically generated patterns in dense suspensions of active filaments.
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DOI：
10.1103/physreve.97.022606
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
K. Prathyusha;S. Henkes;R. Sknepnek
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文献类型：
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作者：
K. Prathyusha;S. Henkes;R. Sknepnek
我们使用朗之万动力学模拟研究了一个致密的平面层的主动半柔性纤维的动力学行为。以主动力的强度和热持续长度为参数，绘制了详细的相图，并确定了该体系中的几个非平衡相。除了一个缓慢流动的熔体相，我们观察到，足够高的活动，集体流动伴随着当地的极性和极性顺序的签名出现在系统中。这种状态的特征还在于强烈的密度波动。此外，我们确定了一个活动驱动的交叉，从这种状态的连贯流动束的细丝没有全球流动的阶段，形成由个别细丝盘绕成旋转的螺旋。这表明系统通过改变活性剂的形状来响应活性的机制，在没有内部自由度的活性颗粒系统中没有类似物的效果。
We use Langevin dynamics simulations to study dynamical behavior of a dense planar layer of active semiflexible filaments. Using the strength of active force and the thermal persistence length as parameters, we map a detailed phase diagram and identify several nonequilibrium phases in this system. In addition to a slowly flowing melt phase, we observe that, for sufficiently high activity, collective flow accompanied by signatures of local polar and nematic order appears in the system. This state is also characterized by strong density fluctuations. Furthermore, we identify an activity-driven crossover from this state of coherently flowing bundles of filaments to a phase with no global flow, formed by individual filaments coiled into rotating spirals. This suggests a mechanism where the system responds to activity by changing the shape of active agents, an effect with no analog in systems of active particles without internal degrees of freedom.