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

doi:10.1088/1674-1056/accd4d

Abstract 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.

Keywords: eccentric disk Langevin dynamics polar order alignment effect

Received: 07 March 2023
Revised: 30 March 2023
Accepted manuscript online: 16 April 2023

PACS:	05.40.-a	(Fluctuation phenomena, random processes, noise, and Brownian motion)
	64.60.Cn	(Order-disorder transformations)
	05.10.Gg	(Stochastic analysis methods)

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

Corresponding Authors: Kang Chen, Wende Tian
E-mail: kangchen@suda.edu.cn;tianwende@suda.edu.cn

Cite this article:

Jinghan Wang(王静晗), Tianliang Xu(许天亮), Jingxi He(何景熙), Kang Chen(陈康), and Wende Tian(田文得) Transition from isotropic to polar state of self-driven eccentric disks 2023 Chin. Phys. B 32 070501

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