We have identified emergence of macroscopic vortices not relying on geometrical confinements in ensembles of active magnetic rollers, leading to spontaneous switching of a vortex’s sense of rotation and to capture and transport of inert cargo particles.
Significance and Impact
Our work exposes the behavior of active roller liquids capable of complex collective behavior, suggesting new pathways for the design and control of microscale tunable transport in active materials.
- Magnetic rollers emerge due to spontaneous uniaxial field-induced chirality breaking
- Rollers couple spinning and translational activities
- Unconfined roller vortices have an ability to traverse the surface
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