Calculation of displacement correlation tensor indicating vortical cooperative motion in two-dimensional colloidal liquids

Abstract

As an indicator of cooperative motion in a system of Brownian particles that models two-dimensional colloidal liquids, displacement correlation tensor is calculated analytically and compared with numerical results. The key idea for the analytical calculation is to relate the displacement correlation tensor, which is a kind of four-point space-time correlation, to the Lagrangian two-time correlation of the deformation gradient tensor. Tensorial treatment of the statistical quantities, including the displacement correlation itself, allows capturing the vortical structure of the cooperative motion. The calculated displacement correlation also implies a negative longtime tail in the velocity autocorrelation, which is a manifestation of the cage effect. Both the longitudinal and transverse components of the displacement correlation are found to be expressible in terms of a similarity variable, suggesting that the cages are nested to form a self-similar structure in the space-time.

18 pages, 8 figures; "X" in math intended as a capital "chi"; accepted by Phys. Rev. E

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Cited by in corpus (5)

• Thermodynamic scaling of vibrational dynamics and relaxation
• Diffusion in crowded colloids of particles cyclically changing their shapes
• Insights from Single-File Diffusion into Cooperativity in Higher Dimensions
• Localization and diffusion of tracer particles in viscoelastic media with active force dipoles
• Displacement correlations in a two-dimensional colloidal liquid and their relationship with shear strain correlations