2021/05/23 by Ali Mozaffari, Rui Zhang, Noé Atzin +3 · 26 citations
Computer Science · Engineering · Physics and Astronomy · #Active matter #Condensed matter physics #Materials science #Micro and Nano Robotics #Modular Robots and Swarm Intelligence #Nonlinear Dynamics and Pattern Formation #Physics #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.126.227801
published in Physical Review Letters 126(22), 227801 (American Physical Society)
arxiv created 2021/05/23 · openalex publication_date 2021/06/02 · arxiv updated 2021/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Topological defects in active liquid crystals can be confined by introducing gradients of activity. Here, we examine the dynamical behavior of two defects confined by a sharp gradient of activity that separates an active circular region and a surrounding passive nematic material. Continuum simulations are used to explain how the interplay among energy injection into the system, hydrodynamic interactions, and frictional forces governs the dynamics of topologically required self-propelling +1/2 defects. Our findings are rationalized in terms of a phase diagram for the dynamical response of defects in terms of activity and frictional damping strength. Different regions of the underlying phase diagram correspond to distinct dynamical modes, namely immobile defects, steady rotation of defects, bouncing defects, bouncing-cruising defects, dancing defects, and multiple defects with irregular dynamics. These dynamic states raise the prospect of generating synchronized defect arrays for microfluidic applications.