Observation of Feshbach resonances in an ${}^{167}$Er-${}^6$Li Fermi-Fermi mixture

Abstract

We present our experimental investigation of the interspecies Feshbach spectrum in a mixture of ${}^{167}$Er($F=19/2,m_F=-19/2$)-${}^6$Li($F=1/2,m_F=1/2$) atoms in the microkelvin temperature regime. These temperatures are achieved by means of sympathetic cooling with ${}^{174}$Yb 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 exmample, novel superfluid states and Efimov states in large mass-imbalanced, all-fermionic two-component systems.

arXiv comment5 pages, 2 figures

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• Universality of Efimov states in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Creation of a degenerate Bose-Bose mixture of erbium and lithium atoms
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture
• BCS-BEC crossover of the strongly interacting ${}^6$Li-${}^{40}$K mixture
• Universal Efimov spectra and fermionic doublets in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Efimov spectrum in the Born--Oppenheimer picture of 2+1 system with zero-range heavy-light interactions