Real space origin of temperature crossovers in supercooled liquids

Details Real space origin of temperature crossovers in supercooled liquids Real space origin of temperature crossovers in supercooled liquids

2003-06-18

arxiv.org/abs/cond-mat/0306469v2

Phys. Rev. E 68, 041201 (2003)

Physics

Condensed Matter

Statistical Mechanics

14 pages, 10 figures; v2: minor stylistic changes and refs added

Scientific paper

10.1103/PhysRevE.68.041201

We show that the various crossovers between dynamical regimes observed in experiments and simulations of supercooled liquids can be explained in simple terms from the existence and statistical properties of dynamical heterogeneities. We confirm that dynamic heterogeneity is responsible for the slowing down of glass formers at temperatures well above the dynamic singularity T_c predicted by mode coupling theory. Our results imply that activated processes govern the long-time dynamics even in the temperature regime where they are neglected by mode-coupling theory. We show that alternative interpretations based on topographic properties of the potential energy landscape are complicated and inefficient ways of describing simple physical features which are naturally accounted for within our approach. We show in particular that the reported links between mode coupling and landscape singularities do not exist.

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