Nonlinear response to probe vitrification

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P4 Heuer, Universität Münster

Nonlinear response from the perspective of energy landscapes

We study the micro- and macro-rheological response of glass-forming systems via computer
simulations. So far we have shown that even in the nonlinear response regime the response in
the micro-rheological setup can be very well interpreted and understood in terms of a continuous
time random walk (CTRW). Its temperature dependence can be related to the underlying
potential energy landscape (PEL). An explicit relation to the occurrence of dynamic heterogeneities
in the quiescent state has been formulated. Key questions for the next funding period
deal, first, with the response to external fields in charged systems. In particular the effect of
electric fields on ionic liquids will be studied. Second, we analyse the macro-rheological response
in terms of a CTRW and the underlying PEL. From studying the finite-size effects new
information about the mechanisms of the linear and nonlinear response may be gained, extending
previous work on quiescent systems along this line.