TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 21 Brundavan Colony, Narsingi, Hyderabad 500 089, India.
Phys Rev Lett. 2013 Dec 6;111(23):238102. doi: 10.1103/PhysRevLett.111.238102.
We present a theory for self-driven fluids, such as motorized cytoskeletal extracts or microbial suspensions, that takes into account the underlying periodic duty cycle carried by the constituent active particles. We show that an orientationally ordered active fluid can undergo a transition to a state in which the particles synchronize their phases. This spontaneous breaking of time-translation invariance gives rise to flow instabilities distinct from those arising in phase-incoherent active matter. Our work is of relevance to the transport of fluids in living systems and makes predictions for concentrated active-particle suspensions and optically driven colloidal arrays.
我们提出了一个自驱动流体的理论，例如马达驱动的细胞骨架提取物或微生物悬浮液，该理论考虑了组成活性粒子所携带的基础周期工作循环。我们表明，各向有序的活性流体可以经历到一个粒子相位同步的状态。这种时间平移不变性的自发破缺导致了与在非相干活性物质中出现的流动不稳定性不同的流动不稳定性。我们的工作与生命系统中流体的输运有关，并对浓缩活性粒子悬浮液和光驱动胶体阵列做出了预测。
