Proposal for the formation of ultracold deeply-bound RbSr dipolar molecules by all-optical methods

Abstract

Ultracold paramagnetic and polar diatomic molecules are among the promising systems for quantum simulation of lattice-spin models. Unfortunately, their experimental observation is still challenging. Based on our recent \textit{ab-initio} calculations, we analyze the feasibility of all-optical schemes for the formation of ultracold ${}^{87}$Rb${}^{84}$Sr bosonic molecules. First, we have studied the formation by photoassociation followed by spontaneous emission. The photoassociation rates to levels belonging to electronic states converging to the ${}^{87}$Rb$(5s{}^{2}S)$+${}^{84}$Sr($5s5p{}^3{P}_{0,1,2}$) asymptotes are particularly small close to the asymptote. The creation of molecules would be more interesting by using deeply levels that preferentially relaxes to the $v^{\prime \prime }=0$ level of the ground state. On the other hands, the photoassociation rates to levels belonging to electronic states converging to the Rb$(5p{}^2{P}_{1/2,3/2})$+Sr($5s^2{}^{1}S$) asymptotes have high value close to the asymptote. The relaxation from the levels close to the asymptotes creates weakly-bound molecules in mosty only one vibrational level. Second, stimulated Raman adiabatic passage (STIRAP) achieved in a tight optical trap efficiently creates weakly-bound ground-state molecules in a well-defined level, thus providing an alternative to magnetic Feshbach resonances to implement several schemes for an adiabatic population transfer toward the lowest ground-state level of RbSr. Finally, we have studied STIRAP process for transferring the weakly-bound molecules into the $v^{\prime \prime }=0$ level of the RbSr ground state.

arXiv comment24 pages, 12 figures, 6 tables

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• Laser-Assisted Self-Induced Feshbach resonance for ultracold polar molecule formation
• Intercombination line photoassociation spectroscopy of ${}^{87}$Rb${}^{170}$Yb
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• Formation of deeply bound polar molecules combining pump-dump pulses with infrared radiation
• Ab initio study of the reactivity of ultracold RbSr$+$RbSr collisions