Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms

Abstract

We report on the realization of a novel degenerate mixture of ultracold fermionic lithium and chromium atoms. Based on an all-optical approach, with an overall duty-cycle of about 13 seconds, we produce large and degenerate samples of more than 2$\times 10^5$ ${}^6$Li atoms and $10^5$ ${}^{53}$Cr atoms, with both species exhibiting normalized temperatures of about $T/T_F$=0.25. Additionally, through the exploitation of a crossed bichromatic optical dipole trap, we can controllably vary the density and degree of degeneracy of the two components almost independently, and widely tune the lithium-to-chromium density ratio. Our ${}^6$Li-${}^{53}$Cr Fermi mixture opens the way to the investigation of a variety of exotic few- and many-body regimes of quantum matter, and it appears as an optimally-suited system to realize ultracold paramagnetic polar molecules, characterized by both electric and magnetic dipole moments. Ultimately, our strategy also provides an efficient pathway to produce dipolar Fermi gases, or spin-mixtures, of ultracold ${}^{53}$Cr atoms.

14 pages, 5 figures

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Cited by in corpus (12)

• Quantum mixtures of ultracold gases of neutral atoms
• Ultracold LiCr: a new pathway to quantum gases of paramagnetic polar molecules
• Quartet Superfluid in Two-dimensional Mass-imbalanced Fermi Mixtures
• Optically trapped Feshbach molecules of fermionic 161Dy and 40K
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• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms
• Ultracold high-spin $\Sigma$-state polar molecules for new physics searches