Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.30: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Noisefree Stochastic Resonance at an Interior Crisis — •Thomas Jüngling, Thomas Stemler, and Hartmut Benner — Institut für Festkörperphysik, TU Darmstadt

We report on the oberservation of noisefree stochastic resonance in an externally driven diode oscillator close to an interior crisis. At sufficiently high excitation amplitudes the diode resonator shows a strange attrator which after the collision with a unstable period 3 orbit exhibits a crisis induced intermittency. In the intermittency regime the system jumps between the previously stable chaotic attractor and the new phase space regions obtainend by the crisis. This random jumping between the two states of the dynamical system can be used to amplify a weak periodic signal via the mechanism of stochastic resonance. In contrast to conventional stochastic resonance no external noise is needed, but its role is taken over by the fast intrinsic chaotic dynamics. We compare our data obtained from the diode resonator with numerical simulations of the logistic map, where a similar crisis induced intermittency is observed.