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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster IV

Q 56.10: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

Resonant spinor dynamics — •Manuel Scherer¹, Oliver Topic¹, Garu Gebreyesus², Phillip Hyllus², Carsten Klempt¹, Wolfgang Ertmer¹, Luis Santos², and Jan Arlt¹ — ¹Institut für Quantenoptik, Leibniz Universität Hannover, Germany — ²Institut für Theoretische Physik, Leibniz Universität Hannover, Germany

Spinor Bose-Einstein condensates (BEC) present an ideal system to investigate the fundamental properties of magnetic superfluids with large spin. This allows for an investigation of the magnetic properties of such samples, but also enables a detailed analysis of the formation of spin domains. Moreover, recent experiments have shown that the spin dynamics in a BEC can provide an enormously sensitive probe for effects at very low energy. In particular it can be used to detect the effects of dipolar interaction and of quantum fluctuations.

The dependence of the spin dynamics on the applied magnetic field however remained elusive. We have observed strong resonances in this dependence, and we show that this resonant behavior is caused by finite-size effects induced by the trapping potential. These resonances can be understood quantitatively be analyzing the stability of spin Bogoliubov excitations and very good agreement between a model including the full dynamics of the system and the experiment is obtained.

We show that the resonant behavior in this system provides extreme sensitivity to effects at the very lowest energy and thus presents an important new tool for the analysis of quantum degenerate systems.