Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 24: Nonlinear stochastic systems

DY 24.5: Vortrag

Dienstag, 25. März 2003, 15:45–16:00, G\"OR/226

A new type of stochastic resonance — •Mykhaylo Evstigneev, Peter Reimann, and Ralph Eichhorn — Universitaet Bielefeld, Universitaetsstrasse 25, Bielefeld, D-33615, Germany

Stochastic resonance (SR), a phenomenon of enhancement of the sensitivity of a noisy system to external forcing, has been an extensively studied topic during the last two decades. One of the most commonly investigated models exhibiting SR is a damped particle in a potential subject to gaussian white noise and harmonic external forcing. Two kinds of SR in such a system have been reported, No-dqconventionalNo-dq and No-dqnon-conventionalNo-dq one. The former occurs in systems with arbitrary damping constant, including the overdamped limit; the necessary condition for such an SR is multistability of the potential. On the other hand, the non-conventional SR is possible in system with arbitrary shape of the potential (excluding the simple harmonic oscillator), but small damping. There is, however, a third type of SR that seems to have been overlooked so far in literature. SR of this kind occurs in monostable overdamped systems, and thus is distinct from the previous two SR types. In this talk, the physics of the SR of the third kind will be discussed and its intuitive explanation will be given.