We analyze the nonlinear active microrheology of dense colloidal suspensions using a schematic model of mode-coupling theory. The model describes the strongly nonlinear behavior of the microscopic friction coefficient as a function of applied external force in terms of a delocalization transition. To probe this regime, we have performed Brownian dynamics simulations of a system of quasi-hard spheres. We also analyze experimental data on hard-sphere-like colloidal suspensions [Habdas et al., Europhys. Lett., 2004, 67, 477]. The behavior at very large forces is addressed specifically.
@article{arxiv.1010.2899,
title = {Schematic Models for Active Nonlinear Microrheology},
author = {Manuel V. Gnann and Igor Gazuz and Antonio M. Puertas and Matthias Fuchs and Thomas Voigtmann},
journal= {arXiv preprint arXiv:1010.2899},
year = {2018}
}