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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Active colloidal fluids exhibit complex self-organization and collective behavior.
  • Spontaneous vortex formation is observed in active matter, but control remains challenging.

Purpose of the Study:

  • To exploit particle persistence length for tuning active vortex formation and size.
  • To investigate the dynamics of emergent multi-vortex states in active roller systems.

Main Methods:

  • Utilized two distinct active roller systems with different approaches to control persistence length (shape anisotropy, polarization memory).
  • Characterized emergent multi-vortex states and their dynamics.
  • Analyzed energy cascade in particle velocity field energy spectra.

Main Results:

  • Demonstrated a direct link between persistence length and emergent vortex properties.
  • Observed anti-ferromagnetic ordering of neighboring vortices.
  • Revealed active turbulent behavior with characteristic energy cascades.

Conclusions:

  • Particle persistence length serves as a control knob for manipulating active vortices in colloidal ensembles.
  • Findings provide insights into spatiotemporal coherence in active roller systems.
  • Suggests new avenues for dynamic self-assembly control in active matter.