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Elastoplasticity Mediates Dynamical Heterogeneity Below the Mode Coupling Temperature.

Rahul N Chacko1,2, François P Landes3, Giulio Biroli4

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review Letters
|August 6, 2021
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Summary
This summary is machine-generated.

Dynamical heterogeneity in supercooled liquids is driven by dynamic facilitation. Below the mode coupling temperature, long-ranged elastic forces enhance this effect, revealing connections between liquid and glass states.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Physical chemistry

Background:

  • Supercooled liquids exhibit dynamical heterogeneity near the glass transition temperature.
  • Dynamic facilitation, where local motion promotes nearby motion, is a key mechanism.
  • Understanding these dynamics is crucial for characterizing glassy systems.

Purpose of the Study:

  • To investigate the role of long-ranged interactions in dynamic facilitation.
  • To explore the emergence of dynamical heterogeneity below the mode coupling temperature.
  • To connect the behavior of supercooled liquids and their corresponding glassy states.

Main Methods:

  • Analysis of dynamical facilitation mechanisms in liquids.
  • Theoretical modeling of elastic interactions.
  • Simulations of supercooled liquid behavior.

Main Results:

  • Identified long-ranged, elastically mediated facilitation below the mode coupling temperature.
  • Confirmed the presence of short-range dynamic facilitation across all temperatures.
  • Demonstrated a link between elastic interactions and cooperative motion.

Conclusions:

  • Long-ranged elastic forces significantly influence dynamical heterogeneity in supercooled liquids.
  • The findings deepen the understanding of the supercooled liquid to glass transition.
  • This work provides insights into the fundamental nature of glassy dynamics.