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Proceedings Paper

Defect diffusion and cooperative dynamics in models of glasses
Author(s): Giulio Biroli; Cristina Toninelli
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Paper Abstract

We present some of our work (done in collaboration with D.S. Fisher) on Kinetically Constrained Lattice Gases focusing on the Kob and Andersen's simple lattice models (KA) for the dynamics of structural glasses. In these systems, although the particles have only hard core interactions, the imposed constraint that they cannot move if surrounded by too many others causes slow dynamics. A very rich dynamical behavior emerges from the simple kinetic rules introduced by KA. Finite dimensional KA models "almost" have a dynamical phase transition: such a transition exists on Bethe lattices and it is replaced by a crossover in finite dimensions. The dominant processes that destroy this putative "mean-field" transition involve cooperative rearrangements of regions, called defects, whose size diverges in the high density limit leading to a physical behavior reminiscent of fragile glass-forming liquids.

Paper Details

Date Published: 25 May 2004
PDF: 10 pages
Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); doi: 10.1117/12.546832
Show Author Affiliations
Giulio Biroli, CEA Saclay (France)
Cristina Toninelli, Lab. de Physique Theorique de l'Ecole Normale Supérieure (France)

Published in SPIE Proceedings Vol. 5469:
Fluctuations and Noise in Materials
Dragana Popovic; Michael B. Weissman; Zoltan A. Racz, Editor(s)

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