Abstract
In the present paper, we experimentally study the diffusive dynamics in ensembles of self-propelled and self-rotating bristle-bots. Considering the dependence of the system dynamics on the packing density of robots as well as on the friction between individual robots, we show that the friction slightly affects the diffusive dynamics but leads to a significant change in the jamming transition corresponding to the formation of rigid clusters of robots.
Highlights
Physics of active matter considers the dynamics of systems composed of particles that can extract energy from their sources and convert this energy into individual and collective motion
Considering the dependence of the system dynamics on the packing density of robots as well as on the friction between individual robots, we show that the friction slightly affects the diffusive dynamics but leads to a significant change in the jamming transition corresponding to the formation of rigid clusters of robots
Various phenomena have been studied in ensembles of self-rotating particles, including phase separation [7] and mixing [8] of particles rotating clockwise and counterclockwise, reversal of collective rotation of active spinners having the same chirality depending on their packing density [9], theory of jamming and unjamming of active rotators [10], and dynamics of active spinners embedded in passive media [11]
Summary
Physics of active matter considers the dynamics of systems composed of particles that can extract energy from their sources and convert this energy into individual and collective motion Examples of such systems include biological ones such as bacterial colonies [1], flocks of birds or fish [2], as well as artificial systems, including ensembles of self-propelled micro-particles [3] or macroscopic robots [4, 5, 6]. 2. Experimental setup In the present work, we consider the ensembles of 33 self-propelled and 22 self-rotating bristlebots (10 clockwise and 12 counterclockwise) vibrating at frequencies between 50 and 100 Hz, figure 1a. To change the friction between robots, side surfaces of individual bristle-bots are covered with different materials ranging from a sandpaper to a paper tape to a plastic tape.
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