Tuning attraction and repulsion between active particles through persistence

Abstract

We consider the interplay between persistent motion, which is a generic property of active particles, and a recoil interaction which causes particles to jump apart on contact. The recoil interaction exemplifies an active contact interaction between particles, which is inelastic and is generated by the active nature of the constituents. It is inspired by the `shock' dynamics of certain microorganisms, such as \emph{Pyramimonas octopus}, and always generates an effective repulsion between a pair of passive particles. Highly persistent particles can be attractive or repulsive, according to the shape of the recoil distribution. We show that the repulsive case admits an unexpected transition to attraction at intermediate persistence lengths, that originates in the advective effects of persistence. This allows active particles to fundamentally change the collective effect of active interactions amongst them, by varying their persistence length.

arXiv comment6 pages; 3 figures; published in EPL (see DOI); reference corrected

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• Non-equilibrium phase transitions in active rank diffusions
• Emergent short-range repulsion for attractively coupled active particles
• Crystal to liquid cross-over for active particles with inverse-square power-law interaction
• From Attraction to Repulsion: Emergent Interactions in Harmonically Coupled Active Binary System
• Curvature-Driven Density and Fluctuations in Interacting AOUPs under Confinement