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Chiral active particles (CAPs) are self-propelling particles that breaktime-reversal symmetry by orbiting or spinning, leading to intriguingbehaviors. Here, we examined the dynamics of CAPs moving in 2D lattices of diskobstacles through active Brownian dynamics simulations and granular experimentswith grass seeds. We find that the effective diffusivity of the CAPs issensitive to the structure of the obstacle lattice, a feature absent in achiralactive particles. We further studied the transport of CAPs in obstacle arraysunder an external field and found a reentrant directional locking effect, whichcan be used to sort CAPs with different activities. Finally, we demonstratedthat the parallelogram lattice of obstacles without mirror symmetry canseparate clockwise and counter-clockwise CAPs. The mechanisms of the abovethree novel phenomena are qualitatively explained. As such, our work provides abasis for designing chirality-based tools for single-cell diagnosis andseparation, and active particle-based environmental sensors.

Chiral Active Particles are Sensitive Reporter to Environmental Geometry