Journal
PHYSICAL REVIEW A
Volume 95, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.95.042701
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [FOR801]
- DFG Excellence Cluster CUI: The Hamburg Centre for Ultrafast Imaging, Structure, Dynamics, and Control of Matter on the Atomic Scale
- AFOSR MURI Grant [FA9550-09-1-0617]
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Magnetically tunable Feshbach resonances are an indispensable tool for experiments with atomic quantum gases. We report on 37 thus far unpublished Feshbach resonances and four further probable Feshbach resonances in spin mixtures of ultracold fermionic K-40 with temperatures well below 100 nK. In particular, we locate a broad resonance at B = 389.7G with a magnetic width of 26.7 G. Here 1 G = 10(-4) T. Furthermore, by exciting low- energy spin waves, we demonstrate a means to precisely determine the zero crossing of the scattering length for this broad Feshbach resonance. Our findings allow for further tunability in experiments with ultracold 40K quantum gases.
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