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Hyperuniform density fluctuations and diverging dynamic correlations in periodically driven colloidal suspensions.

Elsen Tjhung1, Ludovic Berthier1

  • 1Laboratoire Charles Coulomb, UMR 5221, CNRS and Université Montpellier, Montpellier 34095, France.

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Summary
This summary is machine-generated.

Particle irreversibility in driven colloidal suspensions signals a nonequilibrium phase transition. This transition is marked by hyperuniform density fluctuations and glassy dynamics, distinguishing it from chaotic particle motion.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Particle irreversibility in periodically driven colloidal suspensions is often attributed to nonequilibrium phase transitions or chaotic particle trajectories.
  • Distinguishing between these two theoretical interpretations has been challenging.

Purpose of the Study:

  • To investigate the characteristics of particle irreversibility in driven colloidal suspensions.
  • To determine if specific observable signatures can differentiate between a nonequilibrium phase transition and chaotic dynamics.

Main Methods:

  • Utilized a simplified model of a periodically driven colloidal suspension.
  • Analyzed static density fluctuations and dynamic heterogeneities.
  • Examined single-particle and collective particle dynamics.

Main Results:

  • A nonequilibrium phase transition was found to be associated with hyperuniform static density fluctuations.
  • Strong dynamic heterogeneities, similar to those in glassy materials, were observed near the transition.
  • Single-particle dynamics exhibited intermittency and non-Fickian behavior.
  • Collective dynamics showed spatial correlations over diverging length scales.

Conclusions:

  • The study demonstrates that a nonequilibrium phase transition in driven colloidal suspensions is accompanied by distinct static and dynamic signatures.
  • These signatures, including hyperuniformity and glassy dynamics, can potentially differentiate this transition from chaotic particle motion.
  • Particle-resolved measurements of static and dynamic observables are proposed as experimental tools for discrimination.