Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Glasses (joint session CPP/DY, organized by DY)
CPP 51.11: Vortrag
Donnerstag, 10. März 2016, 12:30–12:45, H48
Nonlinear Microrheology of Supercooled Liquids in Terms of an Effective Temperature — •Carsten Schroer1,2 and Andreas Heuer1,2 — 1Westfälische Wilhelms-Universität Münster, Institut für physikalische Chemie, Corrensstraße 28/30, 48149 Münster, Germany — 2NRW Graduate School of Chemistry, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
We perform computer simulations of a fragile model glass-former in which a single particle is driven by an external force through the liquid. Thereby, we track the path the system takes through its underlying Potential Energy Landscape (PEL) and aim for understanding how this is altered by the external field[1,2] and how the altering is related to the nonlinear responses of dynamic quantities.
In this talk, we show that, for strong forces, the thermodynamic state and the local kinetics of the system is altered by the external force in a similar way as an increase of the (bath) temperatures. This behavior gives rise to the definition of an effective temperature that turns out to be characterized by a single force and temperature-independent parameter only, even for bath temperature below the computer glass transition. Combining these observations enables us to derive scaling relations for the nonlinear mobility and the diffusive properties of the tracer particle that are tested with our numerical data [3].
[1] C. F. E. Schroer, A. Heuer, J. Chem. Phys. 138, 12A518 (2013). [2] C. F. E. Schroer, A. Heuer, Phys. Rev. Lett. 110, 067801 (2013). [3] C. F. E. Schroer, A. Heuer, J. Chem. Phys. (accepted) (2015).