Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 3: Ultracold atoms, ions, and BEC I (joint session A/Q)
A 3.1: Hauptvortrag
Montag, 9. März 2020, 11:00–11:30, f303
Creation of ultracold bosonic 23Na39K ground state molecules — •Kai Konrad Voges, Philipp Gersema, Torsten Hartmann, Mara Meyer zum Alten Borgloh, Torben Alexander Schulze, Alessandro Zenesini, and Silke Ospelkaus — Universität Hannover, Institut für Quantenoptik
Heteronuclear ground state molecules, with their large electric dipole moments, are an excellent platform for the investigation of fascinating dipolar quantum phenomena.
Bialkali ground state molecules are assembled from an ultracold atomic quantum gas mixture by utilizing Feshbach molecule association and subsequent stimulated Raman adiabatic passage (STIRAP) to the ground state.
In this talk we present the coherent creation of bosonic 23Na39K rovibrational ground state molecules following this pathway. We perform radio frequency pulses to populate a weakly bound molecular state close to a broad Feshbach resonance. We analyze the molecule creation efficiency with respect to the atom number ratio and radio frequency pulse duration. After that, we transfer the Feshbach molecules to a single spin-polarized hyperfine ground state using STIRAP through strongly coupled c3Σ (v=30) and B1Π (v=8) states, which we investigated spectroscopically beforehand. In this way we reach efficiencies of up to 70 %. We model the transfer process by incorporating multiple states from the excited state manifold and find a good agreement with our experimental results.