Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K

Abstract

We report on the observation of Feshbach resonances at low magnetic field strength (below 10 G) in the Fermi-Fermi mixture of ${}^{161}$Dy and ${}^{40}$K. We characterize five resonances by measurements of interspecies thermalization rates and molecular binding energies. As a case of particular interest for applications, we consider a resonance near 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 100 ms 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 new experimental possibilities in view of mass-imbalanced superfluids and related phenomena.

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Cited by in corpus (7)

• Realization of a quantum degenerate mixture of highly magnetic and nonmagnetic atoms
• Observation of Feshbach resonances in an ${}^{167}$Er-${}^6$Li Fermi-Fermi mixture
• Optically trapped Feshbach molecules of fermionic 161Dy and 40K
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Observation of coherent oscillations in association of dimers from a thermal gas of ultracold atoms
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses
• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms