Observation of Feshbach Resonances in an167Er–6Li Fermi–Fermi Mixture

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We present our experimental investigation of the interspecies Feshbach spectrum in a mixture of 167Er(F = 19/2, mF = −19/2)–6Li(F = 1/2, mF = 1/2) atoms in the microkelvin temperature regime. These temperatures are achieved by means of sympathetic cooling with 174Yb as a third species. Interspecies Feshbach resonances are then identified by investigation of the Er–Li inelastic collisional properties for magnetic fields up to 800 G. Numerous narrow resonances as well as six resonances with widths above 1 G could be identified. It is these broader resonances that hold much promise for interesting future investigations of, for example, novel superfluid states and Efimov states in large mass-imbalanced, all-fermionic two-component systems.