Long range stress correlations in the inherent structures of liquids at rest

Simulation studies of the atomic shear stress in the local potential energy minima (inherent structures) are reported for binary liquid mixtures in 2D and 3D. These inherent structure stresses are fundamental to slow stress relaxation and high viscosity in supercooled liquids. We find that the atomi...

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Bibliographic Details
Published in:The Journal of chemical physics 2016-03, Vol.144 (12), p.124508-124508
Main Authors: Chowdhury, Sadrul, Abraham, Sneha, Hudson, Toby, Harrowell, Peter
Format: Article
Language:English
Subjects:
Anisotropy
BINARY MIXTURES
CORRELATIONS
Decay rate
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LIQUIDS
Physics
POTENTIAL ENERGY
SHEAR
Shear stress
STRESS RELAXATION
STRESSES
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Summary:Simulation studies of the atomic shear stress in the local potential energy minima (inherent structures) are reported for binary liquid mixtures in 2D and 3D. These inherent structure stresses are fundamental to slow stress relaxation and high viscosity in supercooled liquids. We find that the atomic shear stress in the inherent structures (IS’s) of both liquids at rest exhibits slowly decaying anisotropic correlations. We show that the stress correlations contribute significantly to the variance of the total shear stress of the IS configurations and consider the origins of the anisotropy and spatial extent of the stress correlations.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4944620