Boundaries Control Collective Dynamics of Inertial Self-Propelled Robots

Physical Review Letters
A DeblaisH Kellay

Abstract

Simple ingredients, such as well-defined interactions and couplings for the velocity and orientation of self-propelled objects, are sufficient to produce complex collective behavior in assemblies of such entities. Here, we use assemblies of rodlike robots made motile through self-vibration. When confined in circular arenas, dilute assemblies of these rods act as a gas. Increasing the surface fraction leads to a collective behavior near the boundaries: polar clusters emerge while, in the bulk, gaslike behavior is retained. The coexistence between a gas and surface clusters is a direct consequence of inertial effects as shown by our simulations. A theoretical model, based on surface mediated transport accounts for this coexistence and illustrates the exact role of the boundaries. Our study paves the way towards the control of collective behavior: By using deformable but free to move arenas, we demonstrate that the surface induced clusters can lead to directed motion, while the topology of the surface states can be controlled by biasing the motility of the particles.

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Citations

Jul 25, 2019·Physical Review. E·Hartmut Löwen
May 5, 2020·Soft Matter·Chen Wang, Hongyuan Jiang
Sep 13, 2019·Scientific Reports·Takuma Narizuka, Yoshihiro Yamazaki
Oct 20, 2019·Nature Communications·Sukyoung WonJeong Jae Wie
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Nov 11, 2019·Nature Communications·Benoit VincentiEric Clement
May 18, 2020·The Journal of Chemical Physics·Chen Wang, Hongyuan Jiang
Nov 28, 2019·Physical Review. E·Yanpei Chen, Wei Wang
Jun 6, 2020·Physical Review Letters·A DeblaisS Woutersen
Oct 24, 2019·Physical Review. E·Takuma Narizuka, Yoshihiro Yamazaki
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Dec 19, 2020·Physical Review Letters·Thomas BaroisHamid Kellay
Jan 16, 2021·The Journal of Chemical Physics·Lorenzo Caprini, Umberto Marini Bettolo Marconi
Mar 31, 2021·Physical Review Letters·Gao WangLiyu Liu
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Jul 7, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhengjia WangBin Yang
Oct 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·G H Philipp NguyenHartmut Löwen

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