Spatially Heterogeneous Dynamics and Dynamic Facilitation in a Model of Viscous Silica

by: Michael Vogel, Sharon C Glotzer

Physical Review Letters, Vol. 92, No. 25. (2004)

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Abstract

We perform molecular dynamics simulations to study the structural relaxation dynamics of a model of viscous silica, the prototype of a strong glass former. We find that the melt dynamics are spatially heterogeneous regardless of whether the bulk relaxation is non-Arrhenius or Arrhenius, and cannot be understood as a statistical bondbreaking process. Further, we show that stringlike motion is suppressed by the covalent bondings, yet high particle mobility propagates continuously, supporting the concept of dynamic facilitation emphasized in recent theoretical work.

@article{citeulike:782016, abstract = {We perform molecular dynamics simulations to study the structural relaxation dynamics of a model of viscous silica, the prototype of a strong glass former. We find that the melt dynamics are spatially heterogeneous regardless of whether the bulk relaxation is non-Arrhenius or Arrhenius, and cannot be understood as a statistical bondbreaking process. Further, we show that stringlike motion is suppressed by the covalent bondings, yet high particle mobility propagates continuously, supporting the concept of dynamic facilitation emphasized in recent theoretical work.}, author = {Vogel, Michael and Glotzer, Sharon C. }, citeulike-article-id = {782016}, doi = {10.1103/PhysRevLett.92.255901}, journal = {Physical Review Letters}, keywords = {cluster, collaboration, people, simulation}, number = {25}, posted-at = {2006-08-02 00:08:21}, priority = {2}, publisher = {APS}, title = {Spatially Heterogeneous Dynamics and Dynamic Facilitation in a Model of Viscous Silica}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000092000025255901000001\&idtype=cvips\&gifs=yes}, volume = {92}, year = {2004} }

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TY - JOUR ID - citeulike:782016 L3 - citeulike-article-id:782016 TI - Spatially Heterogeneous Dynamics and Dynamic Facilitation in a Model of Viscous Silica JF - Physical Review Letters VL - 92 IS - 25 PB - APS N2 - We perform molecular dynamics simulations to study the structural relaxation dynamics of a model of viscous silica, the prototype of a strong glass former. We find that the melt dynamics are spatially heterogeneous regardless of whether the bulk relaxation is non-Arrhenius or Arrhenius, and cannot be understood as a statistical bondbreaking process. Further, we show that stringlike motion is suppressed by the covalent bondings, yet high particle mobility propagates continuously, supporting the concept of dynamic facilitation emphasized in recent theoretical work. KW - cluster KW - collaboration KW - people KW - simulation AU - Vogel, Michael AU - Glotzer, Sharon PY - 2004/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000092000025255901000001&idtype=cvips&gifs=yes ER -

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