Dynamics in inhomogeneous liquids and glasses via the test particle limit

Details Dynamics in inhomogeneous liquids and glasses via the test particle limit Dynamics in inhomogeneous liquids and glasses via the test particle limit

2006-09-26

arxiv.org/abs/cond-mat/0609663v1

Phys. Rev. E 75, 040501(R) (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevE.75.040501

We show that one may view the self and the distinct part of the van Hove dynamic correlation function of a simple fluid as the one-body density distributions of a binary mixture that evolve in time according to dynamical density functional theory. For a test case of soft core Brownian particles the theory yields results for the van Hove function that agree quantitatively with those of our Brownian dynamics computer simulations. At sufficiently high densities the free energy landscape underlying the dynamics exhibits a barrier as a function of the mean particle displacement, shedding new light on the nature of glass formation. For hard spheres confined between parallel planar walls the barrier height oscillates in-phase with the local density, implying that the mobility is maximal between layers, which should be experimentally observable in confined colloidal dispersions.

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