Magnetic Feshbach resonances with spin-singlet atoms: a narrow path to ultracold paramagnetic polar molecules
Magnetic Feshbach resonances (MFRs) are used to control interactions between ultracold neutral atoms, extending the reach of this platform to broad investigation of both few and many body physics. MFRs are also a critical ingredient in the formation of high phase space density molecular samples from trapped atomic mixtures. Yet the intriguing insights made possible by using MFRs either to form molecules or control interactions have been accessed only in mixtures of alkali atoms (spin doublet), limiting the Hilbert space that can be explored with this powerful tool. I will present progress on the expansion of MFRs into more exotic atomic mixtures by discussing our recent observation of Feshbach resonances in a non-bialkali mixture of 173Yb (spin-singlet) and 6Li (spin doublet). I will also confirm the theoretical basis for these Feshbach resonances through spectroscopy done with full control on the colliding atoms’ degrees of freedom. Finally, I will discuss the feasibility of using this MFR to create ultracold, polar, paramagnetic molecules and the investigations that would be possible with the realization of this platform.