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.

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

References in corpus (6)

• Motility-Induced Phase Separation
• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Universal survival probability for a $d$-dimensional run-and-tumble particle
• First-passage time of run-and-tumble particles
• Exact Solution of Two Interacting Run-and-Tumble Random Walkers with Finite Tumble Duration
• Stationary nonequilibrium bound state of a pair of run and tumble particles

Cited by in corpus (6)

• From a microscopic solution to a continuum description of active particles with a recoil interaction in one dimension
• Fluctuations in the active Dyson Brownian motion and the overdamped Calogero-Moser model
• Emergent short-range repulsion for attractively coupled active particles
• Non-equilibrium phase transitions in active rank diffusions
• 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