Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 5: Ultracold atoms, ions, and BEC I (joint session A/Q)
Q 5.2: Talk
Monday, March 9, 2020, 11:30–11:45, f303
Spin-rotation coupling in p-wave Feshbach resonances — •Manuel Gerken1, Binh Tran1, Eleonora Lippi1, Bing Zhu1,2, Stefan Häfner1, Juris Ulmanis1, Eberhard Tiemann3, and Matthias Weidemüller1,2 — 1Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China — 3Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
We report on the observation of spin-rotation coupling in p-wave Feshbach resonances in an ultracold mixture of fermionic 6Li and bosonic 133Cs. In addition to the doublet structure in the Feshbach spectrum due to spin-spin interaction, we observe a triplet structure of different mℓ states by magnetic field dependent atom-loss spectroscopy. Here, the mℓ states are projections of the pair-rotation angular momentum ℓ on the external magnetic field. Through comparison with coupled-channel calculations, we attribute the observed splitting of the mℓ=±1 components to electron spin-rotation coupling. Comparison with an oversimplified model, estimating the spin-rotation coupling by describing the weakly bound close-channel molecular state with the perturbative multipole expansion, reveals the significant contribution of the molecular wavefunction at short internuclear distances. Our findings highlight the potential of Feshbach resonances in providing precise information on short- and intermediate-range molecular couplings and wavefunctions. We also present measurements of spin-spin coupling in p-wave Feshbach resonances in a Li6 mixture.