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.

Revised version v3; Supplemental Material available as ancillary file

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