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arXiv · 2505.21207

Spectroscopy and Ground-State Transfer of Ultracold Bosonic $^{39}$K$^{133}$Cs Molecules

Krzysztof P. Zamarski·Charly Beulenkamp·Yi Zeng·Manuele Landini·Hanns-Christoph Nägerl
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Abstract

We report the creation of ultracold samples of $^{39}$K$^{133}$Cs molecules in their rovibrational ground state. By investigating potentially suitable excited states using one- and two-photon spectroscopy, we have identified a pathway to the ground state via an exceptionally narrow intermediate state. Using Stimulated Raman Adiabatic Passage (STIRAP), we create trapped samples of up to 3500 molecules at temperatures of 1 $μ$K with one-way efficiencies of 71%. The lifetime of these samples is limited by a near-universal two-body loss process, which could shed new light on similar loss mechanisms in other molecular species. Our results are a step towards establishing an alternative platform for the study of bosonic and fermionic quantum matter with strong dipolar interactions.

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Krzysztof P. Zamarski, Charly Beulenkamp, Yi Zeng, Manuele Landini, Hanns-Christoph Nägerl. 2025-06-11. Spectroscopy and Ground-State Transfer of Ultracold Bosonic $^{39}$K$^{133}$Cs Molecules. https://arxiv.org/abs/2505.21207

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