Spatially heterogeneous dynamics and dynamic facilitation in a model of viscous silica

Abstract

Performing molecular dynamics simulations, we find that the structural relaxation dynamics of viscous silica, the prototype of a strong glass former, are spatially heterogeneous and cannot be understood as a statistical bond breaking process. Further, we show that high particle mobility predominantly propagates continuously through the melt, supporting the concept of dynamic facilitation emphasized in recent theoretical work.

arXiv comment4 pages, 4 figures

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