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Molecular random tilings as glasses.

Juan P Garrahan1, Andrew Stannard, Matthew O Blunt

  • 1School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom. juan.garrahan@nottingham.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|September 2, 2009
PubMed
Summary
This summary is machine-generated.

This study reveals that defects in 2D rhombus tilings drive structural relaxation, similar to glasses. Defect dynamics create heterogeneity, offering insights into dynamic arrest in complex systems.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Statistical Mechanics

Background:

  • p-terphenyl-3,5,3',5'-tetracarboxylic acid forms 2D rhombus random tilings on graphite.
  • These tilings exhibit long-range correlations with sparse defects.

Purpose of the Study:

  • To explore the analogy between dynamic arrest in 2D random tilings and structural glasses.
  • To understand the mechanisms of structural relaxation and dynamic heterogeneity in these systems.

Main Methods:

  • Analysis of tiling defect dynamics.
  • Study of scaling properties of system dynamics.
  • Comparison with kinetically constrained models of glasses.

Main Results:

  • Structural relaxation occurs through defect propagation and reaction.
  • Dynamic heterogeneity arises from defect-driven relaxation.
  • The system's dynamics show specific scaling properties.

Conclusions:

  • 2D random tilings exhibit glass-like dynamic arrest behavior.
  • Defect dynamics are crucial for understanding relaxation and heterogeneity in these systems.
  • The findings provide a link between random tilings and kinetically constrained models.