Dresden 2006 – scientific programme

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.27: Poster

Thursday, March 30, 2006, 16:00–18:00, P1

Stochastic Resonance and Resonant Activation in Colloidal Suspensions — •Carmen Schmitt and Clemens Bechinger — 2. Physikalisches Institut, Universität Stuttgart, Germany

Stochastic Resonance and Resonant Activation are two prominent examples for noise-induced phenomena in nonlinear systems. Studying the dynamics of colloidal particles fluctuating in double well potentials created by optical tweezers, we have the experimental tools to investigate both effects in the same system. We present systematic measurements on bona fide Stochastic Resonance and compare the behavior of three different measures used in this context: the area under the first peak of the residence time distribution, the hysteresis loop area and phase synchonization. In addition to Stochastic Resonance we also observe Resonant Activation in our system. We demonstrate that the ’resonances’ are located at different modulation frequencies.