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Bulletin of the American Physical Society

Single and two photon spectroscopy of ultracold dipolar $^{\mathrm{6}}$Li-$^{\mathrm{40}}$K molecules

Anbang Yang, Sofia Botsi, Sunil Kumar, Anbangkai Dieckmann, Mark Lam, Andrew Laugharn

Published May 30, 2018• 0 citations
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We demonstrate a two-photon pathway to the ground state of 6 Li 40 K molecules that involves only singlet-to-singlet optical transitions.We start from a molecular state which contains a significant admixture from the singlet ground state potential by selecting the Feshbach resonance for molecule association.With the only contributing singlet state to the molecular state being fully stretched and with control over the lasers polarization we address a sole hyperfine component of the excited A 1 Σ + potential without resolving its hyperfine structure.This scheme ensures access to only one ground state hyperfine component with sufficient Franck-Condon factors and moderate laser powers for both coupling transitions.Its implementation results in large and balanced Rabi frequencies, a favourable condition for the coherent transfer to the ground state.We perform dark resonance spectroscopy to precisely determine the transition frequencies of the states involved.The strong dipolar nature of 6 Li 40 K is revealed by Stark spectroscopy, as it is necessary for the study of dipolar interactions in an optical lattice.

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Single and two photon spectroscopy of ultracold dipolar 6^{\mathrm{6}}6Li-40^{\mathrm{40}}40K molecules
Photoassociation and ionization spectroscopy of ultracold 7^{7}7Li-85^{85}85Rb molecules
We create fermionic dipolar 23 Na 6 Li molecules in their triplet ground state from an ultracold mixture of 23 Na and 6 Li.Using magnetoassociation across a narrow Feshbach resonance followed by a two-photon stimulated Raman adiabatic passage to the triplet ground state, we produce 3 × 10 4 ground state molecules in a spin-polarized state.We observe a lifetime of 4.6 s in an isolated molecular sample, approaching the p-wave universal rate limit.Electron spin resonance spectroscopy of the triplet state was used to determine the hyperfine structure of this previously unobserved molecular state.
We create fermionic dipolar ^{23}Na^{6}Li molecules in their triplet ground state from an ultracold mixture of ^{23}Na and ^{6}Li. Using magnetoassociation across a narrow Feshbach resonance followed by a two-photon stimulated Raman adiabatic passage to the triplet ground state, we produce 3×10^{4} ground state molecules in a spin-polarized state. We observe a lifetime of 4.6 s in an isolated molecular sample, approaching the p-wave universal rate limit. Electron spin resonance spectroscopy of the triplet state was used to determine the hyperfine structure of this previously unobserved molecular state.
We demonstrate a two-photon pathway to the ground state of 6 Li 40 K molecules that involves only singlet-to-singlet optical transitions.We start from a molecular state which contains a significant admixture from the singlet ground state potential by selecting the Feshbach resonance for molecule association.With the only contributing singlet state to the molecular state being fully stretched and with control over the lasers polarization we address a sole hyperfine component of the excited A 1 Σ + potential without resolving its hyperfine structure.This scheme ensures access to only one ground state hyperfine component with sufficient Franck-Condon factors and moderate laser powers for both coupling transitions.Its implementation results in large and balanced Rabi frequencies, a favourable condition for the coherent transfer to the ground state.We perform dark resonance spectroscopy to precisely determine the transition frequencies of the states involved.The strong dipolar nature of 6 Li 40 K is revealed by Stark spectroscopy, as it is necessary for the study of dipolar interactions in an optical lattice.