Resonantly Interacting Fermi-Fermi Mixture of ${}^{161}$Dy and ${}^{40}$K

Abstract

We report on the realization of a Fermi-Fermi mixture of ultracold atoms that combines mass imbalance, tunability, and collisional stability. In an optically trapped sample of ${}^{161}$Dy and ${}^{40}$K, we identify a broad Feshbach resonance centered at a magnetic field of $217$G. Hydrodynamic expansion profiles in the resonant interaction regime reveal a bimodal behavior resulting from mass imbalance. Lifetime studies on resonance show a suppression of inelastic few-body processes by orders of magnitude, which we interpret as a consequence of the fermionic nature of our system. The resonant mixture opens up intriguing perspectives for studies on novel states of strongly correlated fermions with mass imbalance.

arXiv commentRevised version v3; Supplemental Material available as ancillary file

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