An Experimental Platform for Studying the Heteronuclear Efimov Effect with an Ultracold Mixture of ⁶Li and ¹33Cs Atoms

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We present the experimental apparatus enabling the observation of the heteronuclear Efimov effect in an optically trapped ultracold mixture of ⁶ 6 Li- ¹³³ 133 Cs with high-resolution control of the interactions. A compact double-species Zeeman slower consisting of four interleaving helical coils allows for a fast-switching between two optimized configurations for either Li or Cs and provides an efficient sequential loading into their respective MOTs. By means of a bichromatic optical trapping scheme based on species-selective trapping we prepare mixtures down to 100 nK of 1× 10⁴ 1 × 10 4 Cs atoms and 7× 10³ 7 × 10 3 Li atoms. Highly stable magnetic fields allow high-resolution atom-loss spectroscopy and enable to resolve splitting in the loss feature of a few tens of milligauss. These features allowed for a detailed study of the Efimov effect.