Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonlinear stochastic systems
DY 30.5: Vortrag
Freitag, 29. Februar 2008, 11:15–11:30, MA 001
Noisefree Stochastic Resonance at an Interior Crisis — •Thomas Jüngling1, Thomas Stemler1,2, Hartmut Benner1, and Wolfram Just3 — 1Institut für Festkörperphysik, TU-Darmstadt, 64289 Darmstadt, Germany — 2School of Mathematics and Statistics, University of Western Australia, Crawley, Australia — 3Queen Mary/University of London, United Kingdom
We report on the observation of noisefree stochastic resonance in an externally driven diode resonator close to an interior crisis. At sufficiently strong excitation the diode resonator shows a strange attractor which, after the collision with a unstable period-3 orbit, exhibits crisis-induced intermittency. In the intermittency regime the system jumps between the previously stable chaotic attractor and the new phase space regions accessible due to the crisis. The random jumping between these two dynamic states can be used to amplify a weak periodic signal through the mechanism of stochastic resonance. In contrast to conventional stochastic resonance no external noise is needed, but its role is taken on by the fast intrinsic chaotic dynamics. Our data obtained at the diode resonator are compared with numerical results from the logistic map, where a similar crisis-induced intermittency is observed.