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

physical review letters

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