Observation of low-field Feshbach resonances between Dy 161 and K 40

Zhu Xiong Ye, Alberto Canali, Elisa Soave, Marian Kreyer, Yaakov Yudkin, Cornelis Ravensbergen, Emil Kirilov, Rudolf Grimm

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8 Scopus citations

Abstract

We report on the observation of Feshbach resonances at low magnetic-field strength (below 10 G) in the Fermi-Fermi mixture of Dy161 and K40. We characterize five resonances by measurements of interspecies thermalization rates and molecular binding energies. As a case of particular interest for future experiments, we consider a resonance at 7.29 G, which combines accurate magnetic tunability and access to the universal regime of interactions with experimental simplicity. We show that lifetimes of a few hundred milliseconds can be achieved for the optically trapped, resonantly interacting mixture. We also demonstrate the hydrodynamic expansion of the mixture in the strongly interacting regime and the formation of DyK Feshbach molecules. Our work opens up experimental possibilities in view of mass-imbalanced superfluids and related phenomena.

Original languageEnglish
Article number043314
JournalPhysical Review A
Volume106
Issue number4
DOIs
StatePublished - Oct 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

Funding

We thank M. Zaccanti and D. Petrov for stimulating discussions and V. Corre and J. H. Han for contributions in the early stage of this work. The project received funding from the European Research Council under the European Union's Horizon 2020 research and innovation program (Grant Agreement No. 101020438, SuperCoolMix). We further acknowledge support by the Austrian Science Fund (FWF) within Project No. P34104-N and within the Doktoratskolleg ALM (Grant No. W1259-N27). We also acknowledge support from the ErasmusProgramme of the European Union and the Austria-Israel Academic Network Innsbruck at the University of Innsbruck. We thank the members of the ultracold-atom groups in Innsbruck for many stimulating discussions and for sharing technological expertise.

FundersFunder number
Horizon 2020 Framework Programme
European Commission
European Commission
Austrian Science FundW1259-N27
Horizon 2020101020438
Universität Innsbruck

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