Feshbach resonances of large mass-imbalance Er-Li mixtures

Abstract

We report on the experimental observation of Feshbach resonances in large mass-imbalance mixtures of Erbium (Er) and Lithium (Li). All combinations between 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.

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

“…Figure 1 provides an overview of FR scans for four of the six Li-Cr combinations explored herein, from which important insights can be gained. None of the mixtures exhibits a dense, chaotic FR spectrum, in con- trast with mixtures of alkalis and Er or Dy lanthanides [51,57]. Similarly to well-known bi-alkali systems, see e.g.…”