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Active-parameter polydispersity in the 2d ABP Yukawa model.

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Area of Science:

  • Soft matter physics
  • Statistical mechanics
  • Computational physics

Background:

  • Particle size polydispersity is common in active matter studies.
  • Active Brownian particles (ABPs) are a key model system.
  • Motility-induced phase separation (MIPS) is a critical phenomenon in ABPs.

Purpose of the Study:

  • Investigate the impact of polydispersity in parameters other than particle size.
  • Examine the effects on structure and dynamics of two-dimensional ABPs.
  • Explore uniform and binary distributions in homogeneous and MIPS phases.

Main Methods:

  • Computational simulations of active Brownian particles.
  • Yukawa pair interactions were employed.
  • Polydispersity was introduced in translational diffusion, rotational diffusion, and swim velocity.

Main Results:

  • Minimal changes in structure and dynamics were observed with up to 50% polydispersity.
  • Swim velocity polydispersity showed significant variations in the radial distribution function during MIPS.
  • Dynamics were only modestly affected even with swim velocity polydispersity.

Conclusions:

  • Parameter polydispersity has a limited effect on ABP systems.
  • Swim velocity polydispersity is an exception, influencing MIPS structure.
  • Temporary polydispersity could aid equilibration in glass-forming active systems.