Structure in sheared supercooled liquids: Dynamical rearrangements of an effective system of icosahedra

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Abstract

We consider a binary Lennard-Jones glassformer whose super-Arrhenius dynamics are correlated with the formation of particles organized into icosahedra under simple steady state shear. We recast this glassformer as an effective system of icosahedra [Pinney et al., J. Chem. Phys. 143, 244507 (2015)]. From the observed population of icosahedra in each steady state, we obtain an effective temperature which is linearly dependent on the shear rate in the range considered. Upon shear banding, the system separates into a region of high shear rate and a region of low shear rate. The effective temperatures obtained in each case show that the low shear regions correspond to a significantly lower temperature than the high shear regions. Taking a weighted average of the effective temperature of these regions (weight determined by region size) yields an estimate of the effective temperature which compares well with an effective temperature based on the global mesocluster population of the whole system.

Original languageEnglish
Article number234501
Number of pages9
JournalJournal of Chemical Physics
Volume145
Issue number23
Early online date15 Dec 2016
DOIs
Publication statusPublished - 21 Dec 2016

Keywords

  • Glass
  • Supercooled Liquids
  • Icosahedra

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