SAMOP 2021 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Ultra-cold atoms, ions, and BEC (joint session A/Q)
Q 13.2: Poster
Wednesday, September 22, 2021, 16:30–18:30, P
Exploring p-Wave Feshbach Resonances in ultracold 6Li and 6Li-133Cs — •Manuel Gerken1, Kilian Welz1, Binh Tran1, Eleonora Lippi1, Stephan Häfner1, Lauriane Chomaz1, Bing Zhu3, Eberhard Tiemann2, and Matthias Weidemüller1,3 — 1Physikalisches Institut, University of Heidelberg — 2Institut für Quantenoptik, University of Hannover — 3University of Science and Technology of China
We report on the observation of spin-rotation coupling in p-wave Feshbach resonances in 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. We present and estimation of the spin-rotation coupling by describing the weakly bound close channel molecular state with the perturbative multipole expansion, valid in the range R>RLR, where R is the inter nuclear distance and RLR is the LeRoy radius. The underestimation of the coupling reveals a significant contribution of the molecular wave function at short inter-nuclear distances R<RLR. We also present measurements of spin-spin coupling in p-wave Feshbach resonances in a 6Li mixture and calculations of collisional cooling close to a 6Li p-wave Feshabch resonance.