Optimizing circular rotations in confined systems via enhanced self-driven speed of active nematics  

作　　者：Tian Tang Chun-lai Ren Yu-qiang Ma 

机构地区：[1]National Laboratory of Solid State Microstructures and Department of Physics,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]Hefei National Laboratory,Hefei 230088,China

出　　处：《Communications in Theoretical Physics》2025年第3期157-164,共8页理论物理通讯(英文版)

基　　金：supported by the National Key Research and Development Program of China under Grant No.2022YFA1405000;Innovation Program for Quantum Science and Technology under Grant No.2024ZD0300101;the National Natural Science Foundation of China under Grant Nos.12274212,12174184,12347102。

摘　　要：Active matter exhibits collective motions at various scales.Geometric confinement has been identified as an effective way to control and manipulate active fluids,with much attention given to external factors.However,the impact of the inherent properties of active particles on collective motion under confined conditions remains elusive.Here,we use a highly tunable active nematics model to study active systems under confinement,focusing on the effect of the self-driven speed of active particles.We identify three distinct states characterized by unique particle and flow fields within confined active nematic systems,among which circular rotation emerges as a collective motion involving rotational movement in both particle and flow fields.The theoretical phase diagram shows that increasing the self-driven speed of active particles significantly enhances the region of the circular rotation state and improves its stability.Our results provide insights into the formation of high quality vortices in confined active nematic systems.

关 键 词：active nematics collective motion CONFINEMENT circular rotation 

分 类 号：O311[理学—一般力学与力学基础]