Transition from isotropic to polar state of self-driven eccentric disks  

作　　者：王静晗 许天亮 何景熙 陈康 田文得 Jinghan Wang;Tianliang Xu;Jingxi He;Kang Chen;Wende Tian(Center for Soft Condensed Matter Physics&Interdisciplinary Research,School of Physical Science and Technology,Soochow University,Suzhou 215006,China)

机构地区：[1]Center for Soft Condensed Matter Physics&Interdisciplinary Research,School of Physical Science and Technology,Soochow University,Suzhou 215006,China

出　　处：《Chinese Physics B》2023年第7期296-302,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.21674078,21774091,and 21574096).

摘　　要：Inspired by the eccentricity design of self-driven disks,we propose a computational model to study the remarkable behavior of this kind of active matter via Langevin dynamics simulations.We pay attention to the effect of rotational friction coefficient and rotational noise on the phase behavior.A homogeneous system without rotational noise exhibits a sharp discontinuous transition of orientational order from an isotropic to a polar state with the increase of rotational friction coefficient.When there is rotational noise,the transition becomes continuous.The formation of polar state originates from the effective alignment effect due to the mutual coupling of the positional and orientational degrees of freedom of each disk.The rotational noise could weaken the alignment effect and cause the large spatial density inhomogeneity,while the translational noise homogenizes the system.Our model makes further conceptual progress on how the microscopic interaction among self-driven agents yields effective alignment.

关 键 词：eccentric disk Langevin dynamics polar order alignment effect 

分 类 号：O469[理学—凝聚态物理]