Locally favoured structures and dynamic length scales in a simple glass-former

Cp Royall, Walter Kob

Research output: Contribution to journalSpecial issue (Academic Journal)peer-review

17 Citations (Scopus)
283 Downloads (Pure)

Abstract

We investigate the static and dynamic properties of a weakly polydisperse hard sphere system in the deeply supercooled state, i.e. at densities higher than that corresponding to the mode-coupling transition. The structural analysis reveals the emergence of icosahedral locally favoured structures, previously only found in trace quantities. We present a new approach to probe the shape of dynamically heterogeneous regions, which is insensitive to particle packing effects that can hamper such analysis. Our results indicate that the shape of the dynamically heterogeneous regions changes only weakly and moreover hint that the often-used four-point correlation length may exhibit a growth in excess of that which our method identifies. The growth of the size of the dynamically heterogeneous regions appears instead to be in line with the one of structural and dynamic propensity correlations.
Original languageEnglish
Number of pages17
JournalJournal of Statistical Mechanics: Theory and Experiment
Volume2017
DOIs
Publication statusPublished - 6 Feb 2017

Keywords

  • dynamical heterogeneities
  • glasses (colloidal, polymer, etc)
  • glasses (structural)
  • slow relaxation
  • glassy dynamics
  • aging

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