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M Gruber1, G C Abade1, A M Puertas2

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We investigated how a probe particle moves in a colloidal glass under an external force. Below a critical force, the particle stays localized; above it, the particle moves, exhibiting intermittent dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Colloidal glasses are complex fluids exhibiting solid-like properties.
  • Understanding particle dynamics in nonequilibrium systems is crucial for materials science.
  • Probe particle motion reveals fundamental properties of glassy media.

Purpose of the Study:

  • To investigate the dynamics of a probe particle driven by a constant force in a colloidal glass.
  • To analyze the transition from localized to delocalized motion.
  • To compare theoretical predictions with simulation results.

Main Methods:

  • Developed a new implementation of the mode-coupling approximation (MCA) with multiple relaxation channels.
  • Employed Langevin dynamics simulations to model probe particle behavior.
  • Analyzed probe dynamics, including cage-scale motion and critical power-law decay.

Main Results:

  • Identified a critical force threshold separating localized and delocalized regimes.
  • Observed power-law decay in the probe correlation function near the transition.
  • Theoretical predictions for probe van Hove functions showed exponential tails, indicating intermittent dynamics.

Conclusions:

  • The study elucidates the nonequilibrium dynamics of a driven probe in a colloidal glass.
  • A force threshold governs the transition between localized and mobile states.
  • Simulations confirm the intermittent dynamics predicted by the theory.