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Area of Science:

  • Soft Matter Physics
  • Complex Systems Dynamics

Background:

  • Particles with competing interactions form various structures (crystal, stripe, labyrinth, bubble).
  • Probe particle dynamics are influenced by these structures and interactions.

Purpose of the Study:

  • Investigate the driven dynamics of a probe particle in a multi-particle system.
  • Characterize the probe particle's depinning threshold and flow regimes.
  • Analyze the influence of interaction parameters and particle density on probe dynamics.

Main Methods:

  • Simulating a probe particle in a system with repulsive and attractive interactions.
  • Varying the ratio of attraction to repulsion and particle density.
  • Analyzing depinning threshold, sliding velocity, and flow states.

Main Results:

  • A depinning-like threshold separates elastic and plastic flow regimes for the probe particle.
  • Depinning threshold and velocity vary nonmonotonically with interaction ratio and density.
  • Distinct flow states and effective drag forces emerge, with jumps at structural transitions.
  • A finite Hall angle is observed in an edge transport state along oriented stripes.

Conclusions:

  • The probe particle's motion is highly sensitive to the underlying particle assembly's structure.
  • Transitions between different collective states significantly alter the probe particle's dynamics and drag.
  • The system exhibits complex, nonmonotonic responses to changes in interaction parameters and density.