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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.5: Poster

Wednesday, February 27, 2008, 16:00–18:30, Poster A

Colloids in non-equilibrium steady states - Direct measurement of a reponse function — •Maximilian Semmling, Valentin Blickle, and Clemens Bechinger — 2. Physikalisches Institut, Universität Stuttgart

The Brownian motion in equilibrium has been studied for long time. In recent times remarkable progress in the understanding of non-equilibrium systems was made. The Jarzynski Relation and other fluctuations theorems of non-equilibrium systems have been tested for different experimental setups.

As the simplest case we study non-equilibrium steady states of colloidal particles. In our setup we use a rotating laser trap to apply a tilted periodic potential to the particle. We obtain different non-equilibrium steady states by changing the driving force of the laser. We measure the time dependent velocity response of the system driven from one steady state to another.