Aranson Igor S, Pikovsky Arkady
Departments of Biomedical Engineering, Chemistry, and Mathematics, Penn State University, University Park, Pennsylvania 16802, USA.
Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24/25, 14476 Potsdam-Golm, Germany.
Phys Rev Lett. 2022 Mar 11;128(10):108001. doi: 10.1103/PhysRevLett.128.108001.
Active matter broadly covers the dynamics of self-propelled particles. While the onset of collective behavior in homogenous active systems is relatively well understood, the effect of inhomogeneities such as obstacles and traps lacks overall clarity. Here, we study how interacting, self-propelled particles become trapped and released from a trap. We have found that captured particles aggregate into an orbiting condensate with a crystalline structure. As more particles are added, the trapped condensates escape as a whole. Our results shed light on the effects of confinement and quenched disorder in active matter.
活性物质广泛涵盖自驱动粒子的动力学。虽然均匀活性系统中集体行为的起始相对已得到较好理解，但诸如障碍物和陷阱等不均匀性的影响仍缺乏整体的清晰认识。在此，我们研究相互作用的自驱动粒子如何被陷阱捕获以及从陷阱中释放。我们发现被捕获的粒子聚集成具有晶体结构的轨道凝聚体。随着更多粒子的加入，被捕获的凝聚体整体逃逸。我们的结果揭示了活性物质中约束和淬火无序的影响。
