Ultracold Gas of Bosonic (NaK)-Na-23-K-39 Ground-State Molecules

Year: 2020

Authors: Voges Kai K., Gersema P., Borgloh MMZ., Schulze TA., Hartmann T., Zenesini A., Ospelkaus S.

Autors Affiliation: Leibniz Univ Hannover, Inst Quantenopt, D-30167 Hannover, Germany; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy

Abstract: We report the creation of ultracold bosonic dipolar (NaK)-Na-23-K-39 molecules in their absolute rovibrational ground state. Starting from weakly bound molecules immersed in an ultracold atomic mixture, we coherently transfer the dimers to the rovibrational ground state using an adiabatic Raman passage. We analyze the two-body decay in a pure molecular sample and in molecule-atom mixtures and find an unexpectedly low two-body decay coefficient for collisions between molecules and K-39 atoms in a selected hyperfine state. The preparation of bosonic (NaK)-Na-23-K-39 molecules opens the way for future comparisons between fermionic and bosonic ultracold ground-state molecules of the same chemical species.


Volume: 125 (8)      Pages from: 083401-1  to: 083401-6

More Information: We thank M. Siercke for enlightening comments and discussions and the group of P. O. Schmidt, PTB Brunswick, for providing scientific material for the Raman laser system. We gratefully acknowledge financial support from the European Research Council through ERC Starting Grant POLAR and from the Deutsche Forschungsgemeinschaft (DFG) through CRC 1227 (DQ-mat), project A03, and FOR 2247, project E5. P. G. thanks the DFG for financial support through RTG 1991.
KeyWords: Ultracold Molecules, Atom-molecule collision, NaK, Stirap
DOI: 10.1103/PhysRevLett.125.083401

Citations: 76
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