What does the potential energy landscape tell us about the dynamics of supercooled liquids and glasses?

Details What does the potential energy landscape tell us about the dynamics of supercooled liquids and glasses? What does the potential energy landscape tell us about the dynamics of supercooled liquids and glasses?

2003-06-12

arxiv.org/abs/cond-mat/0306343v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevLett.91.235501

For a model glass-former we demonstrate via computer simulations how macroscopic dynamic quantities can be inferred from a PEL analysis. The essential step is to consider whole superstructures of many PEL minima, called metabasins, rather than single minima. We show that two types of metabasins exist: some allowing for quasi-free motion on the PEL (liquid-like), the others acting as traps (solid-like). The activated, multi-step escapes from the latter metabasins are found to dictate the slowing down of dynamics upon cooling over a much broader temperature range than is currently assumed.

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