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Anomalous flocking in nonpolar granular Brownian vibrators

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  • Yangrui Chen

    (Shanghai Jiao Tong University)

  • Jie Zhang

    (Shanghai Jiao Tong University
    Shanghai Jiao Tong University)

Abstract

Using Brownian vibrators, we investigated the structures and dynamics of quasi-2d granular materials, with packing fractions (ϕ) ranging from 0.111 to 0.832. Our observations revealed a remarkable large-scale flocking behavior in hard granular disk systems, encompassing four distinct phases: granular fluid, flocking fluid, poly-crystal, and crystal. Anomalous flocking emerges at ϕ = 0.317, coinciding with a peak in local density fluctuations, and ceased at ϕ = 0.713 as the system transitioned into a poly-crystal state. The poly-crystal and crystal phases resembled equilibrium hard disks, while the granular and flocking fluids differed significantly from equilibrium systems and previous experiments involving uniformly driven spheres. This disparity suggests that collective motion arises from a competition controlled by volume fraction, involving an active force and an effective attractive interaction resulting from inelastic particle collisions. Remarkably, these findings align with recent theoretical research on the flocking motion of spherical active particles without alignment mechanisms.

Suggested Citation

  • Yangrui Chen & Jie Zhang, 2024. "Anomalous flocking in nonpolar granular Brownian vibrators," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50479-7
    DOI: 10.1038/s41467-024-50479-7
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    References listed on IDEAS

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    4. Christian Scholz & Michael Engel & Thorsten Pöschel, 2018. "Rotating robots move collectively and self-organize," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    5. G. W. Baxter & J. S. Olafsen, 2003. "Gaussian statistics in granular gases," Nature, Nature, vol. 425(6959), pages 680-680, October.
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