Emergence of Long-Ranged Stress Correlations at the Liquid to Glass Transition

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Physical Review Letters. 2017, 119(26), 265701. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.119.265701
Zusammenfassung

A theory for the nonlocal shear stress correlations in supercooled liquids is derived from first principles. It captures the crossover from viscous to elastic dynamics at an idealized liquid to glass transition and explains the emergence of long-ranged stress correlations in glass, as expected from classical continuum elasticity. The long-ranged stress correlations can be traced to the coupling of shear stress to transverse momentum, which is ignored in the classic Maxwell model. To rescue this widely used model, we suggest a generalization in terms of a single relaxation time τ for the fast degrees of freedom only. This generalized Maxwell model implies a divergent correlation length ξ∝τ as well as dynamic critical scaling and correctly accounts for the far-field stress correlations. It can be rephrased in terms of generalized hydrodynamic equations, which naturally couple stress and momentum and furthermore allow us to connect to fluidity and elastoplastic models.

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ISO 690MAIER, Manuel, Annette ZIPPELIUS, Matthias FUCHS, 2017. Emergence of Long-Ranged Stress Correlations at the Liquid to Glass Transition. In: Physical Review Letters. 2017, 119(26), 265701. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.119.265701
BibTex
@article{Maier2017-12-29Emerg-41644,
  year={2017},
  doi={10.1103/PhysRevLett.119.265701},
  title={Emergence of Long-Ranged Stress Correlations at the Liquid to Glass Transition},
  number={26},
  volume={119},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Maier, Manuel and Zippelius, Annette and Fuchs, Matthias},
  note={Article Number: 265701}
}
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