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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)

Q 64.34: Poster

Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG

Confinement-induced stabilization of a resonantly interacting ultracold Bose-Fermi mixture — •Tommaso Vedovello, D Digvijay, Premjith Thekkeppatt, Klaasjan van Druten, and Florian Schreck — Van der Waals-Zeeman Institute, University of Amsterdam, Netherlands

Alkaline--alkaline-earth dimers exhibit both an electric and a magnetic dipole moment and they are a promising platform for studying quantum many-body effects, precision measurements, quantum computation and quantum chemistry. In our experiment [1] we aim to produce such molecules starting from an ultracold Bose-Fermi 87Rb-87Sr mixture. The ultracold scattering properties of this mixture have been previously determined in our group [2,3], and the mixture was found to be resonantly interacting, with losses attributed to 3-body recombination [4]. We observed the suppression of these losses by confining the gas to lower dimension in a 1D optical lattice . In such a quasi-2D regime, the resonantly interacting mixture has a long lifetime, up to hundreds of milliseconds, which is an excellent starting point for pursuing molecule formation, for instance through confinement-induced resonance [5]. Our immediate next goal is to confirm this through a two-photon scheme (STIRAP). This is the next step towards creating the first ultracold open-shell heteronuclear ground-state molecules.

[1] P. Thekkepatt, et al., PRL 135, 193001 (2025) [2] A. Ciamei, et al., Phys.Chem.Chem.Phys 20, 26221 (2018) [3] V. Barbé et al., Nat. Phys.14, 881 (2018) [4] P.O. Fedichev, et al., PRL 77, 2921 (1996) [5] L. Oghittu et al., PRA 112, 043313 (2025)

Keywords: ultracold; molecules; polar; mixture; open-shell