Tunable Memory and Activity of Quincke Particles in Micellar Fluid

作     者：杨洋 张梦菲 朱来来 张天辉 Yang Yang;Meng Fei Zhang;Lailai Zhu;and Tian Hui Zhang

作者机构：Center for Soft Condensed Matter Physics and Interdisciplinary Research&School of Physical Science and TechnologySoochow UniversitySuzhou 215006China Department of Mechanical EngineeringNational University of Singapore117575Singapore 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2023年第40卷第12期

页      面：98-103页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11974255) Singapore Ministry of Education Academic Research Fund Tier 2 (Grant Nos. MOET2EP50221-0012 and MOE-T2EP50122-0015) 

主　　题：particles collective directions 

摘      要：Memory can remarkably modify the collective behavior of active particles. We show that, in a micellar fluid, Quincke particles driven by a square-wave electric field exhibit a frequency-dependent memory. Upon increasing the frequency, a memory of directions emerges, whereas the activity of particles decreases. As the activity is dominated by interaction, Quincke particles aggregate and form dense clusters, in which the memory of the direction is further enhanced due to the stronger electric interactions. The density-dependent memory and activity result in dynamic heterogeneity in flocking and offer a new opportunity for research of collective motions.