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Related Experiment Videos

A two-time-scale, two-temperature scenario for nonlinear rheology

Berthier1, Barrat, Kurchan

  • 1Laboratoire de Physique, ENS-Lyon, France.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 14, 2000
PubMed
Summary

External forces suppress aging in glassy systems, making them time-invariant. This drive-induced shear thinning and two-temperature behavior offer new insights into jammed matter dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Statistical Mechanics
  • Nonlinear Dynamics

Background:

  • Glassy and jammed systems typically exhibit aging, where their properties evolve over time.
  • External driving forces can alter the equilibrium dynamics of these complex systems.

Purpose of the Study:

  • To investigate the effects of external non-conservative forces on glassy/jammed systems.
  • To analyze the suppression of aging and changes in correlation/response functions under driving.

Main Methods:

  • Utilizing a dynamical closure approximation, exact for disordered, fully connected models.
  • Analyzing the dependence of relaxation time and response functions on drive intensity and temperature.

Main Results:

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  • Demonstrated "shear thinning": relaxation time decreases with increasing drive.
  • Observed two-time-scale relaxation in correlation functions below the glass transition temperature (Tc).
  • Characterized the violation of the fluctuation-dissipation theorem, revealing a two-temperature regime.

    • Conclusions:

    • External driving can induce time-translation invariance and suppress aging in glassy systems.
    • The observed phenomena, like shear thinning and the two-temperature regime, may extend beyond mean-field models.
    • Results provide testable predictions for experiments and simulations of driven jammed matter.