SAMOP 2021 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 14: Ultracold atoms, ions, and BEC II / Ultracold plasmas and Rydberg systems (joint session A/Q)
Q 14.2: Invited Talk
Thursday, September 23, 2021, 11:15–11:45, H1
Ultracold polar 23Na39K ground-state molecules — •Kai Konrad Voges1, Philipp Gersema1, Mara Meyer zum Alten Borgloh1, Torsten Hartmann1, Torben Alexander Schulze1, Leon Karpa1, Alessandro Zenesini1,2, and Silke Ospelkaus1 — 1Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany — 2INO-CNR BEC Center and Dipartimento di Fisica, Universit ‘a di Trento, 38123 Povo, Italy
Heteronuclear ground-state molecules, with their large electric dipole moments, are an excellent platform for the investigation of fascinating dipolar quantum phenomena.
In this talk we present the coherent creation of the light weight bosonic 23Na39K rovibrational ground state molecules by utilizing Feshbach molecule association and subsequent stimulated Raman adiabatic passage (STIRAP) to the ground state. We are able to create rovibrational ground-state ensembles in a single hyperfine state either as a pure ensemble or in a mixture with ultracold atoms. By applying external electric fields we induce electric molecular dipole moments of up to 1 Debye. We further present our investigations of collisional properties of the molecule-atom mixtures and the pure molecular ensemble. For the latter one we investigate the formation of long-lived sticky complexes and their light excitation by the optical dipole trap. Our measurements put a lower bound on the complex lifetime which is observed to be much larger than predicted by theoretical calculations base on RRKM theory.