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02 July 2020
 
  » arxiv » cond-mat/0306746

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Spatial structures and dynamics of kinetically constrained models for glasses
Cristina Toninelli ; Giulio Biroli ; Daniel S.Fisher ;
Date 30 Jun 2003
Subject Disordered Systems and Neural Networks | cond-mat.dis-nn
AbstractKob and Andersen’s simple lattice models for the dynamics of structural glasses are analyzed. Although the particles have only hard core interactions, the imposed constraint that they cannot move if surrounded by too many others causes slow dynamics. On Bethe lattices a dynamical transition to a partially frozen phase occurs. In finite dimensions there exist rare mobile elements that destroy the transition. At low vacancy density, $v$, the spacing, $Xi$, between mobile elements diverges exponentially or faster in $1/v$. Within the mobile elements, the dynamics is intrinsically cooperative and the characteristic time scale diverges faster than any power of $1/v$ (although slower than $Xi$). The tagged-particle diffusion coefficient vanishes roughly as $Xi^{-d}$.
Source arXiv, cond-mat/0306746
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