Controlling confined collective organisation with taxis
Thery, A.; Chamolly, A.; Lauga, E.
Show abstract
Biased locomotion is a common feature of microorganisms, but little is known about its impact on self-organisation. Inspired by recent experiments showing a transition to large-scale flows, we study theoretically the dynamics of magnetotactic bacteria confined to a drop. We reveal two symmetry-breaking mechanisms (one local chiral and one global achiral) leading to self-organisation into global vortices and a net torque exerted on the drop. The collective behaviour is ultimately controlled by the swimmers microscopic chirality and, strikingly, the system can exhibit oscillations and memory-like features.
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