Spontaneous rotation can stabilise ordered chiral active fluids
Spontaneous rotation can stabilise ordered chiral active fluids
复制标题
自发旋转可以稳定有序的手性活性流体
DOI：
10.1038/s41467-019-08914-7
复制
发表时间：
2018
影响因子：
16.6
通讯作者：
M. Lenz
中科院分区：
文献类型：
--
作者：
A. Maitra;M. Lenz
主动流体动力学理论是研究内部驱动粒子（例如鸟群、细菌悬浮液及其人工类似物）的突现有序相的有力工具。虽然定向有序相的理论现已很成熟，但手性对这些相的影响的研究却少得多。在本文中，我们提出了二维不可压缩系统中定向有序手性粒子的完整动力学理论。我们表明，与非旋转手性粒子相比，旋转手性粒子的相相干态在动量守恒和非守恒系统中都非常稳定。此外，驱动非旋转活性流体中的混沌流的缺陷分离被手性活性粒子的固有旋转所抑制。因此，我们将手性确定为活性系统中显着稳定的来源，这可能是解释某些生物组织、细胞骨架系统和细菌集合的集体行为的关键。活性流体由自驱动粒子组成，消耗能量来驱动自发流动。在这里，作者提出了自发旋转的二维手性活性粒子的一般理论，并表明它们可以形成稳定的、相干旋转的相。
Active hydrodynamic theories are a powerful tool to study the emergent ordered phases of internally driven particles such as bird flocks, bacterial suspension and their artificial analogues. While theories of orientationally ordered phases are by now well established, the effect of chirality on these phases is much less studied. In this paper, we present a complete dynamical theory of orientationally ordered chiral particles in two-dimensional incompressible systems. We show that phase-coherent states of rotating chiral particles are remarkably stable in both momentum-conserved and non-conserved systems in contrast to their non-rotating counterparts. Furthermore, defect separation—which drives chaotic flows in non-rotating active fluids—is suppressed by intrinsic rotation of chiral active particles. We thus establish chirality as a source of dramatic stabilisation in active systems, which could be key in interpreting the collective behaviors of some biological tissues, cytoskeletal systems and collections of bacteria. Active fluids consist of self-driven particles which consume energy to drive spontaneous flow. Here the authors present a general theory of two-dimensional chiral active particles which spontaneously rotate and show that they can form a stable, coherently-rotating phase.
影响因子：
8.6
作者：
Denk, Jonas;Huber, Lorenz;Frey, Erwin
通讯作者：
Frey, Erwin
影响因子：
44.1
作者：
Marchetti, M. C.;Joanny, J. F.;Simha, R. Aditi
通讯作者：
Simha, R. Aditi