Physical Review X (Apr 2022)

Relaxation Dynamics in the Energy Landscape of Glass-Forming Liquids

  • Yoshihiko Nishikawa,
  • Misaki Ozawa,
  • Atsushi Ikeda,
  • Pinaki Chaudhuri,
  • Ludovic Berthier

DOI
https://doi.org/10.1103/PhysRevX.12.021001
Journal volume & issue
Vol. 12, no. 2
p. 021001

Abstract

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We numerically study the zero-temperature relaxation dynamics of several glass-forming models to their inherent structures, following quenches from equilibrium configurations sampled across a wide range of initial temperatures. In a mean-field Mari-Kurchan model, we find that relaxation changes from a power law to an exponential decay below a well-defined temperature, consistent with recent findings in mean-field p-spin models. By contrast, for finite-dimensional systems, the relaxation is always algebraic, with a nontrivial universal exponent at high temperatures crossing over to a harmonic value at low temperatures. We demonstrate that this apparent evolution is controlled by a temperature-dependent population of localized glassy excitations. Our work unifies several recent lines of studies aiming at a detailed characterization of the complex potential energy landscape of glass formers, and challenges both mean-field and real space descriptions of glasses.