Layered Chiral Active Matter: Beyond Odd Elasticity,Physical Review Letters

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Layered Chiral Active Matter: Beyond Odd Elasticity
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-06-16 , DOI: 10.1103/physrevlett.126.248001
S J Kole ₁ , Gareth P Alexander ₂ , Sriram Ramaswamy ₁ , Ananyo Maitra ₃

Affiliation

In equilibrium liquid crystals, chirality leads to a variety of spectacular three-dimensional structures, but chiral and achiral phases with the same broken continuous symmetries have identical long-time, large-scale dynamics. In this Letter, starting from active model

H^{*}

, the general hydrodynamics of a pseudoscalar in a momentum-conserving fluid, we demonstrate that chirality qualitatively modifies the dynamics of layered liquid crystals in active systems in both two and three dimensions due to an active “odder” elasticity. In three dimensions, we demonstrate that the hydrodynamics of active cholesterics differs fundamentally from smectic-A liquid crystals, unlike their equilibrium counterpart. This distinction can be used to engineer a columnar array of vortices, with an antiferromagnetic vorticity alignment, that can be switched on and off by external strain. A two-dimensional chiral layered state—an array of lines on an incompressible, freestanding film of chiral active fluid with a preferred normal direction—is generically unstable. However, this instability can be tuned in easily realizable experimental settings when the film is either on a substrate or in an ambient fluid.

中文翻译：

层状手性活性物质：超越奇弹性

在平衡液晶中，手性导致各种壮观的三维结构，但具有相同连续对称性破坏的手性和非手性相具有相同的长时间、大尺度动力学。在这封信中，从主动模型开始

H^{*}

，动量守恒流体中赝标量的一般流体动力学，我们证明手性由于活跃的“奇数”弹性而定性地改变了二维和三维有源系统中层状液晶的动力学。在三个维度上，我们证明了活性胆甾醇的流体动力学与近晶-A 液晶有着根本的不同，不同于它们的平衡对应物。这种区别可用于设计具有反铁磁涡度对齐的柱状涡流阵列，可以通过外部应变打开和关闭。二维手性层状状态——不可压缩的、独立的手性活性流体膜上的一系列线，具有优选的法线方向——通常是不稳定的。然而，

更新日期：2021-06-16

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