密度介导的自旋关联驱动活性手性物质中边缘到体相流动转变
Density Mediated Spin Correlations Drive Edge to Bulk Flow Transition in Active Chiral Matter
AI总结：
本文研究活性手性颗粒在圆形振动腔中的边缘流如何随密度增加通过摩擦自旋耦合扩展为体相旋转，并提出粗粒化模型解释该转变。
摘要：
我们证明，在活性手性物质中——由带有手性排列倾斜腿的旋转盘状颗粒组成，并限制在圆形振动腔内——由于边界屏蔽效应，在与气体、流体和晶体相对应的广泛密度范围内会形成边缘流。随后表明，随着逾渗团簇的发展，边缘流通过摩擦接触介导的相邻颗粒间自旋耦合增强，日益驱动循环体相流动，其强度随面积分数ϕ增加。即使在稀薄极限下也能观察到边缘流。在低ϕ时，除距离边界单个颗粒直径的范围内，平均通量消失；而穿透深度随ϕ增大而增加，直至达到最高堆积密度时实现固体体旋转，此时颗粒完全被六角序笼住，并与整个堆积体同相自旋。基于颗粒随ϕ增加的碰撞互锁以及有序性的出现，一个粗粒化模型捕捉到了所观测的流场。
英文摘要：
We demonstrate that edge currents develop in active chiral matter -- composed of spinning disk-shaped grains with chirally arranged tilted legs confined in a circular vibrating chamber -- due to boundary shielding over a wide range of densities corresponding to a gas, fluid, and crystal. The edge currents are then shown to increasingly drive circulating bulk flows with area fraction $ϕ$ due to increasing spin-coupling between neighbors mediated by frictional contacts, as percolating clusters develop. Edge currents are observed even in the dilute limit. While, at low $ϕ$, the average flux vanishes except within a distance of a single particle diameter of the boundary, the penetration depth grows with increasing $ϕ$ till a solid body rotation is achieved corresponding to the highest packing, where the particles are fully caged with hexagonal order and spin in phase with the entire packing. A coarse-grained model, based on the increased collisional interlocking of the particles with $ϕ$ and the emergence of order, captures the observed flow fields.
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