TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.19.1.012
TI  - Collective dynamics of densely confined active polar disks with self- and mutual alignment
PY  - 2025/07/08
UR  - https://scipost.org/SciPostPhys.19.1.012
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 19
IS  - 1
SP  - 012
A1  - Tang, Weizhen
AU  - Zheng, Yating
AU  - Shee, Amir
AU  - Lin, Guozheng
AU  - Han, Zhangang
AU  - Romanczuk, Pawel
AU  - Huepe, Cristian
AB  - We study the emerging collective states in a simple mechanical model of a dense group of self-propelled polar disks with off-centered rotation, confined within a circular arena. Each disk presents self-alignment towards the sum of contact forces acting on it, resulting from disk-substrate interactions, while also displaying mutual alignment with neighbors due to having its center of rotation located a distance $R$ behind its centroid, so that central contact forces can also introduce torques. The effect of both alignment mechanisms produces a variety of collective states that combine high-frequency localized circular oscillations with low-frequency milling around the center of the arena, in fluid or solid regimes. We consider cases with small/large $R$ values, isotropic/anisotropic disk-substrate damping, smooth/rough arena boundaries, different densities, and multiple systems sizes, showing that the emergent collective states that we identify are robust, generic, and potentially observable in real-world natural or artificial systems.
ER  -

@Article{10.21468/SciPostPhys.19.1.012,
	title={{Collective dynamics of densely confined active polar disks with self- and mutual alignment}},
	author={Weizhen Tang and Yating Zheng and Amir Shee and Guozheng Lin and Zhangang Han and Pawel Romanczuk and Cristián Huepe},
	journal={SciPost Phys.},
	volume={19},
	pages={012},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.19.1.012},
	url={https://scipost.org/10.21468/SciPostPhys.19.1.012},
}