Stability of a Resonantly Interacting Bose-Fermi Mixture

Ultracold atomic Bose-Fermi mixtures bring a unique degree of flexibility and tunability to the simulation of various quantum many-body phases and phenomena, ranging from condensed matter to nuclear physics. In our work with a ⁶Li-¹³³Cs mixture, [Phys. Rev. Lett. 131, 083003], we observe the collapse and revival of sound propagation across an interspecies Feshbach resonance. The stability of the sound mode in this resonantly interacting mixture is surprising. In this talk, we will discuss our efforts to understand the underlying cause of this phenomenon by measuring quantities such as the BEC fraction, the Li-Cs density overlap, and the effective Cs-Cs interaction strength.