We report on the experimental realization of ultracold 174 Yb-7 Li (Boson-Boson) and 173 Yb-7 Li (Fermion-Boson) mixtures. They are loaded into three dimensional (3D) or one dimensional (1D) optical lattices that are species-selectively deep for the heavy Ytterbium (Yb) and shallow for the light bosonic Lithium (Li) component, realizing novel mixed dimensional systems. In the 1D optical lattice the band structure of 173 Yb is reconstructed in the presence of 7 Li. Spectroscopic measurements of the 174 Yb-7 Li mixture in the 3D lattice give access to the 174 Yb Mott-insulator structure. Ground state inter-species scattering lengths are determined to be |a bg ( 174 Yb-7 Li)| = (1.11 ± 0.17) nm and |a bg ( 173 Yb-7 Li)| = (1.16 ± 0.18) nm. The formation and characterization of an ultracold 173 Yb-7 Li mixture is a first step towards a possible realization of a topological px + i py superfluid in this system.

We report on the experimental observation of Feshbach resonances in large-mass-imbalance mixtures of erbium (Er) and lithium (Li). All combinations of 168 Er, 166 Er, and 7 Li, 6 Li are cooled to temperatures of a few microkelvin, partially by means of sympathetic cooling together with ytterbium (Yb) as a third mixture component. The Er-Li inelastic interspecies collisional properties are studied for magnetic fields up to 680 G. In all cases, resonant interspecies loss features, indicative of Feshbach resonances, have been observed. While most resonances have sub-Gauss widths, a few of them are broad and feature widths of several Gauss. Those broad resonances are a key to the realization of ultracold Er-Li quantum gas mixtures with tunable interactions.