Spatial structures and dynamics of kinetically constrained models for glasses

Details Spatial structures and dynamics of kinetically constrained models for glasses Spatial structures and dynamics of kinetically constrained models for glasses

2003-06-30

arxiv.org/abs/cond-mat/0306746v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages. Accepted for pub. in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.185504

Kob 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 $\Xi^{-d}$.

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