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Large Scale Zigzag Pattern Emerging from Circulating Active Shakers.

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Area of Science:

  • Soft matter physics
  • Active matter systems
  • Fluid dynamics

Background:

  • Active matter systems exhibit complex emergent behaviors.
  • Squirmers are model active particles that generate fluid flow.
  • Understanding self-organization in driven systems is crucial.

Purpose of the Study:

  • To investigate the collective behavior of magnetic rotors acting as active shakers.
  • To analyze the formation of dynamic structures and topological defects.
  • To determine the role of the generated flow field in pattern formation.

Main Methods:

  • Experimental analysis of reversibly actuated magnetic rotors.
  • Particle-based simulations of active shakers in a viscoelastic medium.
  • Characterization of spatiotemporal patterns and flow fields.

Main Results:

  • Emergence of large zigzag bands from the rotor population.
  • Collective organization into dynamic structures with self-similar growth.
  • Generation of topological defects (cusps) connecting vortices of alternating chirality.
  • Demonstration that the shaker-generated flow field is sufficient to reproduce observed patterns.

Conclusions:

  • The flow field generated by active shakers drives self-organization in particle systems.
  • Reduced particle degrees of freedom, like frozen orientational motion, facilitate emergent patterns.
  • This work reveals a self-organization scenario in driven particle systems within viscoelastic media.