Feshbach spectroscopy of ultracold mixtures of $^{6}{\rm Li}$ and $^{164}{\rm Dy}$ atoms

TL;DR

This study reports the observation of 21 Feshbach resonances in ultracold $^6$Li-$^{164}$Dy mixtures, enabling precise control of interactions and opening avenues for exploring impurity physics in strongly interacting quantum gases.

Contribution

First observation of Feshbach resonances in ultracold $^6$Li-$^{164}$Dy mixtures, including broad resonances for interaction tuning and a unique resonance for impurity physics exploration.

Findings

21 interspecies resonances observed over 702 G range

Three resonances exhibit broad widths for interaction control

A well-isolated resonance at 700.1 G for impurity studies

Abstract

We report on the observation of Feshbach resonances in ultracold $^6\mathrm{Li}$-$^{164}\mathrm{Dy}$ mixtures, where $^6\mathrm{Li}$ atoms are respectively prepared in their three lowest spin states, and $^{164}\mathrm{Dy}$ atoms are prepared in their lowest energy state. We observe 21 interspecies scattering resonances over a magnetic field range from 0 to \SI{702}{\gauss} using atom loss spectroscopy, three of which exhibit relatively broad widths. These broad resonances provide precise control over the interspecies interaction strength, enabling the study of strongly interacting effects in $^6\mathrm{Li}$-$^{164}\mathrm{Dy}$ mixtures. Additionally, we observe a well-isolated interspecies resonance at 700.1 G, offering a unique platform to explore novel impurity physics, where heavy dipolar $^{164}\mathrm{Dy}$ atoms are immersed in a strongly interacting Fermi superfluid of $^6\mathrm{Li}$ atoms.