Critical fluctuations and breakdown of Stokes-Einstein relation in the Mode-Coupling Theory of glasses

Details Critical fluctuations and breakdown of Stokes-Einstein relation in the Mode-Coupling Theory of glasses Critical fluctuations and breakdown of Stokes-Einstein relation in the Mode-Coupling Theory of glasses

2006-09-27

arxiv.org/abs/cond-mat/0609705v1

Physics

Condensed Matter

Statistical Mechanics

Proceedings of the workshop on non-equilibrium phenomena in supercooled fluids, glasses and amorphous materials (17-22 Septemb

Scientific paper

We argue that the critical dynamical fluctuations predicted by the mode-coupling theory (MCT) of glasses provide a natural mechanism to explain the breakdown of the Stokes-Einstein relation. This breakdown, observed numerically and experimentally in a region where MCT should hold, is one of the major difficulty of the theory, for which we propose a natural resolution based on the recent interpretation of the MCT transition as a bona fide critical point with a diverging length scale. We also show that the upper critical dimension of MCT is d_c=8.

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