Ultracold ${}^{88}{\mathrm{Sr}}_2$ molecules in the absolute ground state

Abstract

We report efficient all-optical creation of an ultracold gas of alkaline-earth-metal dimers, ${}^{88}{\mathrm{Sr}}_2$, in their absolute ground state. Starting with weakly bound singlet molecules formed by narrow-line photoassociation in an optical lattice, followed by stimulated Raman adiabatic passage (STIRAP) via a singlet-dominant channel in the $(1)0_u^{+}$ excited potential, we prepare pure samples of more than 5500 molecules in $X^1{\Sigma }_g^{+}(v=0,J=0)$. We observe two-body collisional loss rates close to the universal limit for both the least bound and most bound vibrational states in $X^1{\Sigma }_g^{+}$. We demonstrate the enhancement of STIRAP efficiency in a magic-wavelength optical lattice where thermal decoherence is eliminated. Our results pave the way for the use of alkaline-earth-metal dimers for high-precision spectroscopy, and indicate favorable prospects for robust quantum state preparation of ultracold molecules involving closed-shell atoms, as well as molecule assembly in deep optical traps tuned to a magic wavelength.

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