二维活性布朗粒子体系中运动诱导的微相和宏观相分离
Motility-Induced Microphase and Macrophase Separation in a Two-Dimensional Active Brownian Particle System
摘要：
作为非平衡力的结果，纯排斥性自推进颗粒经历浓相和稀相之间的宏观相分离。我们提出了一个深入的研究，这种动力学诱导相分离（MIPS）在两个维度的活性布朗粒子的有序动力学，我们表明，它是一般伴随着微相分离。密相的生长遵循类似于液-气相分离的规律。然而，它是由六角微区的马赛克，其尺寸不会无限粗化，留下一个扩展的拓扑缺陷的网络，从微观稀释气泡出现。这些有限尺寸结构的特征长度随活性而增加，与初始条件的选择无关。
英文摘要：
As a result of nonequilibrium forces, purely repulsive self-propelled particles undergo macrophase separation between a dense and a dilute phase. We present a thorough study of the ordering kinetics of such motility-induced phase separation (MIPS) in active Brownian particles in two dimensions, and we show that it is generically accompanied by microphase separation. The growth of the dense phase follows a law akin to the one of liquid-gas phase separation. However, it is made of a mosaic of hexatic microdomains whose size does not coarsen indefinitely, leaving behind a network of extended topological defects from which microscopic dilute bubbles arise. The characteristic length of these finite-size structures increases with activity, independently of the choice of initial conditions.
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