Nonlinear response in strongly heterogeneous glass-forming mixtures and ion conductors

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The mass transport in strongly heterogeneous mixtures and the disordered Lorentz model is studied using non-equilibrium molecular dynamics simulations, mode-coupling theory, and scaling theory approaches. By investigating the non-linear response to external fields, we aim at revealing the fundamental microscopic processes responsible for anomalous diffusion in such systems, and to understand the connection between fast-ion-conduct ing glass-forming melts, purely entropic binary-mixture model systems, and the Lorentz gas on a theoretical basis. Both the dynamics of the mobile (tracer) particles and that of the slow particle species are considered. In particular, we address the role of collectivity in fast-ion transport and the role of correlations in the heterogeneous glass-forming matrix.