Collision-induced torque mediates transition of chiral dynamic patterns formed by active particles

TL;DR

This paper investigates how collision-induced torque influences the self-organization of active particles, revealing that it can transform homogeneous bi-polar states into rotating mono-polar flocks, advancing understanding of chiral pattern formation.

Contribution

It introduces a numerical model showing how collision-induced torque controls the transition from bi-polar to mono-polar chiral patterns in active particles.

Findings

Collision-induced torque causes transition to rotating mono-polar flocks.

Homogeneous bi-polar orientation can be transformed into chiral patterns.

The model clarifies control factors for pattern formation in active matter.

Abstract

It is still challenging to control dynamic self-organization patterns of self-propelled particles. Although varieties of patterns associated with chirality have been observed, essential control factors determining patterns remain unclear. Here, we explore numerically how torque upon particle collision affects dynamic self-organization. Based on the particle-based model with both collision-induced torque and torque in self-propulsion, we find that introducing collision-induced torque turns homogeneous bi-polar orientation templated by bi-directional alignment into rotating mono-polar flocks.