arXiv:2301.08890 · Physical Review A

Realization of a quantum degenerate mixture of highly magnetic and nonmagnetic atoms

F. Schäfer, Yuki Haruna, Yoshiro Takahashi

Published Mar 29, 2023• 14 citations

Abstract

The authors report the realization of a mixture of atomic Bose-Einstein condensates of highly magnetic erbium and nonmagnetic ytterbium by a sympathetic cooling method. The measurement of the trap lifetime of the mixture shows good collisional stability against three-body losses.

DOI: 10.1103/physreva.107.l031306

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arXiv:2301.08890 · Physical Review A

Realization of a quantum degenerate mixture of highly magnetic and nonmagnetic atoms

F. Schäfer, Yuki Haruna, Yoshiro Takahashi

Published Mar 29, 2023• 14 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physreva.107.l031306

Related papers

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We report the realization of quantum degenerate mixed gases of ytterbium (Yb) isotopes using all-optical methods. We have succeeded in cooling attractively interacting

^{176}\mathrm{Yb}

atoms via sympathetic cooling down to below the Bose-Einstein transition temperature, coexisting with a stable condensate of

^{174}\mathrm{Yb}

atoms with a repulsive interaction. We have observed a rapid atom loss in

^{176}\mathrm{Yb}

atoms after cooling down below the transition temperature, which indicates the collapse of a

^{176}\mathrm{Yb}

condensate. The sympathetic cooling technique has been applied to cool a $^{173}\mathrm{Yb}\text{\ensuremath{-}}^{174}\mathrm{Yb}$ Fermi-Bose mixture to the quantum degenerate regime.

We have produced a quantum degenerate mixture of fermionic alkali-metal

{}^{6}

Li and bosonic spin-singlet

{}^{174}

Yb gases. This was achieved using sympathetic cooling of lithium atoms by evaporatively cooled ytterbium atoms in a far-off-resonant optical dipole trap. We observe the coexistence of Bose-condensed ($T/{T}_{\mathrm{c}}\ensuremath{\simeq}0.8$)

{}^{174}

Yb with $2.3\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms and Fermi degenerate ($T/{T}_{\mathrm{F}}\ensuremath{\simeq}0.3$)

{}^{6}

Li with $1.2\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms. Quasipure Bose-Einstein condensates of up to $3\ifmmode\times\else\texttimes\fi{}{10}^{4}$

{}^{174}

Yb atoms can be produced in single-species experiments. Our results mark a significant step toward studies of few- and many-body physics with mixtures of alkali-metal and alkaline-earth-metal-like atoms, and for the production of paramagnetic polar molecules in the quantum regime. Our methods also establish a convenient scheme for producing quantum degenerate ytterbium atoms in a 1064 nm optical dipole trap.

We report the realization of a degenerate mixture of

^{166}

Er and

^{7}

Li atoms in their energetically lowest spin states. The two species are sequentially laser-cooled and loaded into an optical dipole trap, then transported to a glass cell and simultaneously evaporated to degeneracy. Er serves as the coolant for Li, and we observe efficient sympathetic cooling facilitated by a large interspecies elastic scattering cross section. Three-body losses are found to be small, making this platform promising for the study of interacting mixtures with large mass imbalance.