标题： 手性晶体相的稳定性以及活性-被动手性杆混合物中胆甾相的破坏 显示英文标题

标题： Stability of chiral crystal phase and breakdown of cholesteric phase in mixtures of active-passive chiral rods

摘要： 在本研究中，我们旨在探讨手性对由双温标活性驱动的活性螺旋粒子相行为的影响。 我们首先使用分子动力学（MD）模拟计算了具有不同固有手性的软螺旋粒子的状态方程。 在平衡状态下，各种液晶（LC）相的出现，如向列相（N）、胆甾相（$N_{c}^{*}$）、层状相（Sm）以及晶体（K），关键取决于壁的存在，这些壁诱导了垂直排列。 接下来，我们通过双温模型引入活性：保持一半螺旋粒子的温度升高（标记为“热”粒子），而将另一半粒子的温度维持在较低值（标记为“冷”粒子）。 从均匀各向同性（I）相开始，我们发现出现了2-TIPS：热粒子和冷粒子之间的两种温度诱导的相分离。 我们还观察到，在没有壁的情况下，冷粒子也会发生有序转变，进入各种LC相。 这一观察表明，在活性系统中，热-冷界面起到了平衡系统中壁的作用，为冷粒子诱导了一个排列方向。 然而，在胆甾相的情况下，我们观察到活性通过在冷区诱导层状有序而在热区保持各向同性结构，使$N_{c}^{*}$相失稳。 冷区的层状有序最终在足够高的活性下转变为手性晶体相。 显示英文摘要

摘要： In this study, we aim to explore the effect of chirality on the phase behavior of active helical particles driven by two-temperature scalar activity. We first calculate the equation of state of soft helical particles of various intrinsic chiralities using molecular dynamics (MD) simulation. In equilibrium, the emergence of various liquid crystal (LC) phases such as nematic (N), cholesteric ($N_{c}^{*}$), smectic (Sm), as well as crystal (K), crucially depends on the presence of the walls, which induce homeotropic alignment. Next, we introduce activity through the two-temperature model: keep increasing the temperature of half of the helical particles (labeled as 'hot' particles) while maintaining the temperature of the other half at a lower value (labeled as 'cold' particles). Starting from a homogeneous isotropic (I) phase, we find the emergence of 2-TIPS: two temperature-induced phase separations between the hot and cold particles. We also observe the cold particles undergo an ordering transition to various LC phases even in the absence of a wall. This observation reveals that the hot-cold interface in the active system plays the role of a wall in the equilibrium system by inducing an alignment direction for the cold particles. However, in the case of a cholesteric phase, we observe activity destabilizes the $N_{c}^{*}$ phase by inducing smectic ordering in the cold zone while isotropic structure in the hot zone. The smectic ordering in the cold zone eventually transforms to a chiral crystal phase at high enough activity.