Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.25: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Impact of weak aperiodic signals on the response of a chaotic system: Noise-free Stochastic Resonance — •Johannes Werner1, Thomas Stemler1, Hartmut Benner1, and Andrzej Krawiecki2 — 1Institut für Festkörperphysik, TU-Darmstadt — 2Faculty of Physics, Warsaw University of Technology
In nonlinear autonomous circuits of the Chua family an attractor merging crisis occurs when two coexisting attractors of the precritical system collide as a control parameter (a resistor R) is increased. The system can then jump intermittently between those two subattractors. These jumps can be influenced by a weak signal that is fed into the system. Depending on the control parameter the correlation between input signal and system response varies, reaching several extrema on variation of the control parameter R. This is due to the effect of noise-free stochastic resonance, where the role of the noise is taken on by fast intrinsic dynamics of the system. We show that the dependency of the mean residence time on the control parameter has huge impact on the system’s response behaviour and thus on the cross correlation between input and output. We compare the experimental results obtained with different aperiodic signals — bandwidth limited and dichotomic noise — to theoretical predictions derived from linear response theory.