扁球体圆型游动者的同步向列和反同步向列排列
Synchro-nematic and -antinematic ordering of spheroidal circle swimmers
AI总结：
研究手性游动者集体排列，用动力学理论分析其内在旋转等相互作用，揭示单个游动者形状和驱动各向异性如何决定结果，发现不同同步态致集体相，如同步向列/反同步向列序等
摘要：
手性给微游动者带来直线游动者所没有的相位，它调节并受微游动者间流体动力相互作用影响。本文研究众多此类手性游动者自由移动时出现的集体排列，以及单个游动者的形状和驱动各向异性如何决定结果。利用动力学理论，发现有效锁相相互作用，分析多体系统，得出同步向列和反同步向列序等，粗粒化场论预测向列序起始，还发现集体态有晶体或无序超均匀结构，格子玻尔兹曼模拟验证了同步向列排列。这些结果表明游动者几何和驱动各向异性可用于编程手性活性物质中的同步和时空排列。
英文摘要：
Chirality gives a microswimmer something a straight-line swimmer lacks: a phase. This variable both modulates, and is affected by, the hydrodynamic interactions between microswimmers. Here we ask what collective order emerges when many such chiral swimmers are free to move, and how the shape and actuation anisotropies of an individual swimmer dictate the outcome. Using a kinetic theory for hydrodynamically interacting circle swimmers, we show that the interplay between intrinsic rotation, stresslet flows, and Jeffery-like reorientation generates effective phase-locking interactions. Asymmetries in the actuation are encoded through a non-axisymmetric stresslet tensor. At the pair level, pusher swimmers select one of two synchronized states depending on particle shape and actuation asymmetry: in-phase/anti-phase locking, or quarter-shifted locking. Extending the analysis to many-body systems, we find that these pair-level synchronization mechanisms drive emergent collective phases. The swimmers develop global \textit{synchro-nematic} order when the hydrodynamic coupling favors parallel or anti-parallel phase locking, and \textit{synchro-antinematic} local order where quarter-shifted locking prevails. A coarse-grained field theory predicts the onset of nematic order through a hydrodynamic instability criterion. In addition, we find that the collective states exhibit crystalline or disordered hyperuniform structure arising from period-averaged hydrodynamic interactions that are effectively repulsive between swimmers. Lattice Boltzmann simulations of chiral oblate squirmers, resolving finite-size and near-field flows, recover the synchro-nematic ordering. Together, these results show how a swimmer's geometric and actuation anisotropies can be leveraged to program synchronization and spatiotemporal order in chiral active matter.
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