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arXiv 2105.04571cond-mat.softcond-mat.stat-mech
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加热导致棒的双温活性流体中的液晶和晶序

Heating leads to liquid-crystal and crystalline order in a two-temperature active fluid of rods

Jayeeta Chattopadhyay, Sindhana Selvi Pannir Sivajothi, Kaarthik Varma, Sriram Ramaswamy, Chandan Dasgupta, Prabal K. Maiti

摘要:

本文报道了在纵横比为$L/D = 5 $的软排斥球柱(SRS)体系中标量活度诱导的相分离和液晶有序。通过增加SRS的一半(标记为\textit{`hot'})的温度同时将另一半的温度保持在较低值(标记为\textit{`cold'})来引入活性。由较低温度缩放的两个温度之间的差异提供了活性的量度。从不同的平衡初始相出发,我们发现,活动导致分离的热和冷粒子。与初始平衡态相比,活动还驱动冷粒子通过相变到更有序的状态,并且驱动热粒子到更不有序的状态。均质各向同性(I)结构的冷组分获得α(N)级,并且在较高活性下获得结晶(K)级。类似地,冷区的一个初始状态经历近晶(Sm)和晶体排序以上的临界值的活动,而热的组件变成各向同性。我们发现,热粒子占据了更大的体积,并施加额外的动力学压力,限制,压缩和激发冷粒子域的有序转变。

英文摘要:

We report phase separation and liquid-crystal ordering induced by scalar activity in a system of Soft Repulsive Spherocylinders (SRS) of aspect ratio $L/D = 5 $. Activity was introduced by increasing the temperature of half of the SRS (labeled \textit{`hot'}) while maintaining the temperature of the other half constant at a lower value (labeled \textit{`cold'}). The difference between the two temperatures scaled by the lower temperature provides a measure of the activity. Starting from different equilibrium initial phases, we find that activity leads to segregation of the hot and cold particles. Activity also drives the cold particles through a phase transition to a more ordered state and the hot particles to a state of less order compared to the initial equilibrium state. The cold components of a homogeneous isotropic (I) structure acquire nematic (N) and, at higher activity, crystalline (K) order. Similarly, the cold zone of a nematic initial state undergoes smectic (Sm) and crystal ordering above a critical value of activity while the hot component turns isotropic. We find that the hot particles occupy a larger volume and exert an extra kinetic pressure, confining, compressing and provoking an ordering transition of the cold-particle domains.

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