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Memory-Induced Transition from a Persistent Random Walk to Circular Motion for Achiral Microswimmers

Phys. Rev. Lett. 121, 078003 (2018)

We experimentally study the motion of light-activated colloidal microswimmers in a viscoelastic fluid. We find that, in such a non-Newtonian environment, the active colloids undergo an unexpected transition from enhanced angular diffusion to persistent rotational motion above a critical propulsion speed, despite their spherical shape and stiffness. We observe that, in contrast to chiral asymmetric microswimmers, the resulting circular orbits can...

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