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MO: Fachverband Molekülphysik
MO 19: Poster 3
MO 19.12: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Preparing and characterizing ultracold bosonic 23Na39K spin polarized ground state molecules — •Mara Meyer zum Alten Borgloh1, Philipp Gersema1, Kai Konrad Voges1, Torsten Hartmann1, Leon Karpa1, Alessandro Zenesini2, and Silke Ospelkaus1 — 1Leibniz Universität Hannover, Institut für Quantenoptik — 2INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento
Recently, ultracold polar molecules have become the focus of interest for research in quantum chemistry and metrology. Heteronuclear molecules have a large electric dipole moment, which allows the study of long-range and anisotropic dipole-dipole interactions. Moreover, their large number of degrees of freedom, such as rotation and vibration, opens up new possibilities for quantum simulations. We report the preparation of ground-state bosonic spin-polarized NaK molecules with a large electric dipole moment of 2.7 D. Starting from an ultracold quantum gas mixture of K and Na atoms, we first generate weakly bound molecules near a Feshbach resonance. The Feshbach molecules are then transformed into strongly bound molecules in the absolute molecular ground state by stimulated Raman adiabatic passage (STIRAP). The STIRAP pulse is performed within 12 µs and has an efficiency of about 70 %, preparing up to 4200 molecules at a temperature of about 300 nK. Finally, we report the dependence of the energy structure of the vibrational ground state manifold on the electric field and the manipulation of the molecular hyperfine and rotational state.