Exploring ultracold collisions in ${}^6$Li-${}^{53}$Cr Fermi mixtures: Feshbach resonances and scattering properties of a novel alkali-transition metal system

Abstract

We investigate ultracold collisions in a novel mixture of ${}^6$Li and ${}^{53}$Cr fermionic atoms, discovering more than 50 interspecies Feshbach resonances via loss spectroscopy. Building a full coupled-channel model, we unambiguously characterize the ${}^6$Li-${}^{53}$Cr scattering properties and yield predictions for other isotopic pairs. In particular, we identify various Feshbach resonances that enable the controlled tuning of elastic $s$- and $p$-wave ${}^6$Li-${}^{53}$Cr interactions. Our studies thus make lithium-chromium mixtures emerge as optimally-suited platforms for the experimental search of elusive few- and many-body regimes of highly-correlated fermionic matter, and for the realization of a new class of ultracold polar molecules possessing both electric and magnetic dipole moments.

12 pages, 4 figures, 4 tables

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• Quartet Superfluid in Two-dimensional Mass-imbalanced Fermi Mixtures
• Ultracold LiCr: a new pathway to quantum gases of paramagnetic polar molecules
• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
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• Confinement-induced resonances for the creation of quasi-one-dimensional ultra cold gases of alkali--alkaline-earth dimers
• Universal clusters in quasi-two-dimensional ultracold Fermi mixtures
• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms