Self-trapping of active particles induced by non-reciprocal interactions in disordered media
arxiv(2024)
摘要
Disordered media is known to modify the transport properties of active matter
depending on interactions between particles and with the substrate. Here we
study systems of active particles with visual-like perception that co-align
with the positions of perceived conspecifics, and anti-align with positions of
static obstacles. We report a novel self-trapping mechanism of particles
forming closed loops that progressively shrink, surrounding one or multiple
obstacles.This mechanism corresponds to a pinning behavior preventing particle
diffusion. Increased co-alignment strength is found to reduce loop shrinking
time, although this effect reaches a plateau at higher strengths. Loops are
found to initially exhibit local polar order, but eventually they transition to
nematic states as they absorb more particles. We show a phase diagram
demonstrating self-trapping occurs within a specific range of aperture angles
of the vision cone.
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