手性活性物质中的拓扑态：动态蓝相和活性半skyrmions
Topological states in chiral active matter: dynamic blue phases and active half-skyrmions
摘要：
我们数值研究了活性手性液晶中二维蓝相的动力学。我们发现，引入收缩活动的结果稳定的蓝色相，而小的伸展活动产生有序的，但动态的蓝色相，其特征在于连贯移动的半skyrmions和向错。当扩展活动增加到阈值以上时，半skyrmions的解离和活跃的湍流。我们进一步分析孤立的活动半skyrmions在各向同性的背景和比较活动引起的速度场模拟的分析预测的流量。最后，我们表明，限制一个活跃的蓝相可以引起一个系统范围内的流通，其中半skyrmions和向错一起旋转。
英文摘要：
We numerically study the dynamics of two-dimensional blue phases in active chiral liquid crystals. We show that introducing contractile activity results in stabilised blue phases, while small extensile activity generates ordered but dynamic blue phases characterised by coherently moving half-skyrmions and disclinations. Increasing extensile activity above a threshold leads to the dissociation of the half-skyrmions and active turbulence. We further analyse isolated active half-skyrmions in an isotropic background and compare the activity-induced velocity fields in simulations to an analytical prediction of the flow. Finally, we show that confining an active blue phase can give rise to a system-wide circulation, in which half-skyrmions and disclinations rotate together.
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