Tagged-particle motion in quasi-confined colloidal hard-sphere liquids

Abstract

We investigate the tagged-particle motion in a strongly interacting quasiconfined liquid using periodic boundary conditions along the confining direction. Within a mode-coupling theory of the glass transition (MCT) we calculate the selfnonergodicity parameters and the self-intermediate scattering function and compare them with event-driven molecular dynamics simulations. We observe non-monotonic behavior for the in-plane mean-square displacement and further correlation functions which refer to higher mode indices encoding information about the perpendicular motion.The in-plane velocity-autocorrelation function reveals persistent anticorrelations with a negative algebraic power-law decay t −2 at all packing fractions.