  We design 3D-printed motor-driven active particles and find that their
dynamics can be characterized using the model of overdamped chiral active
Brownian particles (ABPs), as demonstrated by measured angular statistics and
translational mean squared displacements (MSDs). Furthermore, we propose a
minimal model that reproduces the double-peak velocity distributions and
further predicts a transition from the single-peak to the double-peak
displacement distributions in short-time regimes. The model provides a clear
physics picture of these phenomena, originating from the competition between
the active motion and the translational diffusion. Our experiments confirm such
picture. The minimal model enhances our understanding of activity-driven
non-Gaussian phenomena. The designed particles could be further applied in the
study of collective chiral motions.
