Quantum degenerate mixtures of alkali and alkaline-earth-like atoms

Hideaki Hara, Yosuke Takasu, Yoshifumi Yamaoka, John M. Doyle, Yoshiro Takahashi

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133 Citations (Scopus)


We realize simultaneous quantum degeneracy in mixtures consisting of the alkali and alkaline-earth-like atoms Li and Yb. This is accomplished within an optical trap by sympathetic cooling of the fermionic isotope Li6 with evaporatively cooled bosonic Yb174 and, separately, fermionic Yb173. Using cross-thermalization studies, we also measure the elastic s-wave scattering lengths of both Li-Yb combinations, |aLi6-Yb174|=1.0±0.2nm and |aLi6-Yb173|=0.9±0.2nm. The equality of these lengths is found to be consistent with mass-scaling analysis. The quantum degenerate mixtures of Li and Yb, as realized here, can be the basis for creation of ultracold molecules with electron spin degrees of freedom, studies of novel Efimov trimers, and impurity probes of superfluid systems.

Original languageEnglish
Article number205304
JournalPhysical Review Letters
Issue number20
Publication statusPublished - May 19 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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