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Area of Science:

  • * Active matter physics
  • * Statistical mechanics
  • * Soft condensed matter

Background:

  • * Active matter systems exhibit complex behaviors driven by self-propulsion.
  • * Typically, activity in these systems leads to effective attraction.
  • * Understanding emergent interactions is key to controlling active matter.

Purpose of the Study:

  • * To investigate how heterogeneity in self-propulsion speed affects particle interactions.
  • * To demonstrate the emergence of repulsion from attractive potentials due to speed differences.
  • * To analyze the universality and experimental feasibility of this phenomenon.

Main Methods:

  • * Analytical derivation of the stationary distribution for pairwise distances.
  • * Modeling active Brownian particles with harmonic coupling.
  • * Investigating the influence of propulsion speed heterogeneity.

Main Results:

  • * Heterogeneity in self-propulsion speed induces a robust, short-range effective repulsion.
  • * A characteristic repulsive length scale emerges, increasing with speed differences.
  • * This contrasts with the conventional view of activity-induced attraction.

Conclusions:

  • * Self-propulsion speed heterogeneity can lead to counter-intuitive emergent repulsion.
  • * The phenomenon is universal and independent of specific dynamics or thermal fluctuations.
  • * This finding opens new avenues for controlling active matter systems experimentally.