Hannover 2010 – scientific programme
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A: Fachverband Atomphysik
A 14: Atomic Clusters II
A 14.1: Invited Talk
Wednesday, March 10, 2010, 16:30–17:00, F 303
Stochastic Resonance Effects in open Bose-Einstein condensates — •Dirk Witthaut1, Friederike Trimborn2, and Sandro Wimberger3 — 1Max-Planck-Institut für Dynamik und Selbstorganisation, Göttingen, Germany — 2Institut für theoretische Physik, Universität Hannover, Germany — 3Institut für theoretische Physik, Universität Heidelberg, Germany
In our naive understanding noise and dissipation are distracting, hindering measurements and degrading coherences in quantum mechanics. A paradigmatic counterexample to this assertion is the effect of stochastic resonance in nonlinear dynamics, where the response of a system to an external driving assumes its maximum in the presence of an appropriate amount of thermal noise.
In this talk I will discuss stochastic resonance effects for an interacting Bose-Einstein condensate subject to dissipation. For instance, particle loss can restore the phase coherence of a two-mode BEC and repurify a strongly interacting condensate almost completely. Moreover, even the decay induced by a localized perturbation in an optical lattice shows a stochastic resonance effect: If the loss rate becomes too large, dark solitons form which effectively suppress decay.