Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 5: Ultra-cold atoms and molecules II (joint session A/MO/Q)
A 5.6: Talk
Monday, March 11, 2019, 15:15–15:30, S HS 1 Physik
Bose polaron scenario in an ultracold Fermi-Bose mixture of 6Li and 133Cs — •Eleonora Lippi1, Binh Tran1, Manuel Gerken1, Lauritz Klaus1, Bing Zhu1,2, Moritz Drescher3, Manfred Salmhofer3, Tilman Enss3, and Matthias Weidemüller1,2 — 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China — 3Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 19, 69120, Heidelberg, Germany
An ultracold Fermi-Bose mixture of 6Li and 133Cs is an appealing playground to investigate the Bose polaron, a quasi-particle describing a single fermionic Li impurity immersed into a Bose-Einstein condensate (BEC) of Cs and dressed by the phononic excitations of the condensate. The well-suited Feshbach resonances at high magnetic field provide a great degree of tunability of intra- and inter-species interactions, enabling us to explore both the repulsive and the attractive regime of the polaron. Due to the large Li-Cs mass ratio, signatures of 3-body Efimov physics in the energy spectrum of the polaron are expected. The observation of different polaron states from the Landau-Pekar polaron to the bubble polaron is also predicted for a Li-Cs mixture [1].
I will discuss how to combine a large BEC of Cs with Li impurities trapped into a microtrap, and our strategy for investigating Bose polaron’s properties by means of radio-frequency spectroscopy.
[1] M.Drescher et al., arXiv:1810.11296 (2018)