Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 34: Poster VII

A 34.2: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent B

Towards fermionic weakly-bound open-shell RbSr molecules — •Noah Wach^1,2, Digvijay Digvijay¹, Premjith Thekkeppatt¹, Klaasjan van Druten¹, and Florian Schreck¹ — ¹Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, The Netherlands — ²Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

Our goal is to produce ultracold RbSr polar, open-shell molecules, to extend the range of possibilities offered by ultracold molecular physics. Unlike in alkali atoms, Feshbach resonances in alkali-alkaline earth atoms are extremely narrow due to the non-magnetic ground state of alkaline earth atoms. The creation of weakly bound molecules of alkali-alkaline earth atoms is strongly hindered by the very weak coupling of the Feshbach resonances. Here we present our novel approach, utilizing confinement-induced resonances (CIR) in a strongly interacting Bose-Fermi mixture to create weakly bound RbSr molecules. We plan to take advantage of CIR, which strongly couples an excited trapped state of a very weakly bound molecule to the atomic pair state in a strongly interacting Rb-Sr mixture. We also observe the protection against 3-body collisional losses in a strongly interacting Bose-Fermi mixture in the quasi-2D regime.

Keywords: Ultracold molecules; alkali-alkaline earth mixture; Optical Lattice; Confinement induced resonance; Weakly interacting