Dresden 2006 – scientific programme

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.29: Poster

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

Coupling induced dynamics in a ring of discrete bistable systems — •Johannes Werner, Thomas Stemler, and Hartmut Benner — Institut für Festkörperphysik, TU Darmstadt

Unidirectionally coupled bistable systems can show oscillations even in the absence of external forcing. These oscillations occur when an odd number of elements are negatively coupled to form a ring and the coupling strength λ is increased above a critical value λ_c. The frustration induced by the coupling leads to enhanced sensitivity to external signals. Recently, this was utilised in the construction of a highly sensitive magnetometer [1].

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 reproduces most results from [1], it also shows several experimental constraints resulting from the finite frequency response and a small asymmetry of the elements.

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