Dresden 2009 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.32: Poster

Tuesday, March 24, 2009, 14:30–16:30, P1A

Stochastic Resonance in a ring of bistable elements — •Johannes Werner and Hartmut Benner — Institut für Festkörperphysik, Technische Universität Darmstadt

A plethora of effects can be observed in unidirectionally coupled bistable systems. They include auto oscillations and enhaned sensitivity to external signals (e.g. [1]) as well as pattern formation [2]. These effects require an odd number of elements as well as an inverting, sufficiently strong coupling.

We show experimental results obtained from a ring of three negatively coupled Schmitt triggers, which are bistable electronic systems easy to realize. This ring was driven by different types of input signals. While our setup could reproduce most results from [1], it also showed several experimental constraints resulting from the finite frequency response and a small asymmetry of the elements.

In contrast to results from similar systems, e.g. [2], we were could observe stochastic resonance like phenomena, specifically, an increased cross correlation between periodic input and response of the system. The results are supported by numerical experiments.

[1] Bulsara et al. PRE 70, 036103 (2004)

[2] Palacios et al. PRE 74, 021122 (2006)