Hydrodynamic Expansion of a Strongly Interacting Fermi-Fermi Mixture

Abstract

We report on the expansion of a Fermi-Fermi mixture of Li-6 and K-40 atoms under conditions of strong interactions realized near the center of an interspecies Feshbach resonance. We observe two different phenomena of hydrodynamic behavior. The first one is the well-known inversion of the aspect ratio. The second one is a collective expansion, where both species stick together and despite of their different masses expand jointly. Our work constitutes a first step to explore the intriguing many-body physics of this novel system.

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• Theory of ultracold Fermi gases
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• Heavy-Light Fermion Mixtures at Unitarity
• All-optical production of a degenerate mixture of 6Li and 40K and creation of heteronuclear molecules
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