Flowing Active Liquids in a Pipe: Hysteretic Response of Polar Flocks to External Fields

@article{Morin2018FlowingAL,
  title={Flowing Active Liquids in a Pipe: Hysteretic Response of Polar Flocks to External Fields},
  author={A. Morin and D. Bartolo},
  journal={Physical Review X},
  year={2018},
  volume={8},
  pages={021037}
}
We investigate the response of colloidal flocks to external fields. We first show that individual colloidal rollers align with external flows as would a classical spin with magnetic fields. Assembling polar active liquids from colloidal rollers, we experimentally demonstrate their hysteretic response: confined colloidal flocks can proceed against external flows. We theoretically explain this collective robustness, using an active hydrodynamic description, and show how orientational elasticity… Expand

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