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Phase separation, edge currents, and Hall effect for active matter with Magnus dynamics.

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Area of Science:

  • Soft matter physics
  • Statistical mechanics
  • Active matter systems

Background:

  • Run-and-tumble particles are a fundamental model for active matter.
  • Motility-induced phase separation (MIPS) is a key emergent behavior in active systems.
  • The Magnus effect, typically seen in hydrodynamics, can influence particle dynamics.

Purpose of the Study:

  • To investigate the phase behavior and dynamics of 2D run-and-tumble particles with an added Magnus force.
  • To understand how the Magnus component affects MIPS formation and stability.
  • To explore the influence of quenched disorder and external drive on particle dynamics.

Main Methods:

  • Numerical simulations of active particle systems in 2D.
  • Analysis of particle trajectories and collective behaviors.
  • Characterization of phase separation and flow patterns.

Main Results:

  • Increased particle activity leads to MIPS with chiral edge flow around clusters, directionally dependent on the Magnus term.
  • MIPS stability exhibits non-monotonic behavior with increasing Magnus amplitude, first expanding then breaking into a gel-like state.
  • In the presence of disorder and drive, bulk flow shows a drive-dependent Hall angle due to side-jump scattering.

Conclusions:

  • The Magnus force significantly alters the phase diagram and dynamics of active matter systems.
  • Chiral edge flows and non-monotonic stability highlight the complex interplay between activity, Magnus force, and phase separation.
  • The observed Hall angle in disordered systems provides a link to phenomena in magnetic systems.