Flocking and clustering in mixtures of self-propelled particles with or without active reorientation

Abstract

We study phase behaviors of mixtures comprising active particles with and without active reorientation by varying mixing ratios. We observe that the order parameter characterizing flocking in the steady state exhibits a linear decrease with the increase of mixing ratio. While the order parameter characterizing clustering in the steady state presents a sharp leap as the mixing ratio increases. Particularly, we obtain phase diagrams of flocking under different mixing ratios and observe that the domain corresponding to flocking experiences a contraction with the increase of mixing ratio. Simultaneously, the coordinates of critical point on the phase boundary between the flocking and the disordered phase decay exponentially with the mixing ratio.