Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Ultra-cold atoms, ions and BEC III

Q 51.8: Vortrag

Donnerstag, 15. März 2012, 15:45–16:00, V47.02

Precise radio-frequency spectroscopy of weakly bound Li-6 molecules with trap-sideband resolution — •Andre Wenz1,2, Gerhard Zuern1,2, Friedhelm Serwane1,2, Thomas Lompe1,2 und Selim Jochim1,21Physikalisches Institut, Universität Heidelberg — 2Max-Planck-Institut für Kernphysik, Heidelberg

A precise knowledge of the ultracold scattering parameters is vital for most measurements performed with ultracold gases. The position of the Feshbach resonance for example is the main source of uncertainty for the determination of the Bertsch parameter. This parameter, which is universal for every strongly interacting fermionic system, rescales the energy of a resonantly interacting Fermi gas onto a non-interacting one. Its experimental determination strongly relies on the exact position of the Feshbach resonance.

We report on a measurement of the binding energy of a weakly bound molecular state in fermionic Li-6 with an improved accuracy utilizing radio-frequency spectroscopy with resolved trap-sideband resolution. The average error is reduced by more than a factor of 15 compared to previous measurements [Bartenstein et al., PRL 94,103201 (2005)]. This allows to determine the position of the Feshbach Resonance with significantly improved accuracy.

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