Crossover from fragile to strong glassy behavior in kinetically constrained systems

Arnaud Buhot and Juan P. Garrahan
Phys. Rev. E 64, 021505 – Published 18 July 2001
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Abstract

We show the existence of fragile-to-strong transitions in kinetically constrained systems by studying the equilibrium and out-of-equilibrium dynamics of a generic constrained Ising spin chain that interpolates between the symmetric and fully asymmetric cases. We find that for large but finite asymmetry the model displays a crossover from fragile to strong glassy behavior at finite temperature, which is controlled by the asymmetry parameter. The relaxation in the fragile region presents stretched exponential behavior, with a temperature dependent stretching exponent that is predicted. Our results are confirmed by numerical simulations.

  • Received 19 April 2001

DOI:https://doi.org/10.1103/PhysRevE.64.021505

©2001 American Physical Society

Authors & Affiliations

Arnaud Buhot* and Juan P. Garrahan

  • Theoretical Physics, University of Oxford, 1 Keble Road, Oxford, OX1 3NP, United Kingdom

  • *Email address: buhot@thphys.ox.ac.uk
  • Email address: j.garrahan1@physics.ox.ac.uk

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Issue

Vol. 64, Iss. 2 — August 2001

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