A pathway to ultracold bosonic ${}^{23}{\text{Na}}^{39}\text{K}$ ground state molecules

Abstract

We spectroscopically investigate a pathway for the conversion of ${}^{23}{\text{Na}}^{39}\text{K}$ Feshbach molecules into rovibronic ground state molecules via STImulated Raman Adiabatic Passage (STIRAP). Using photoassociation spectroscopy from the diatomic scattering threshold in the $a^3{\Sigma }^{+}$ potential, we locate the resonantly mixed electronically excited intermediate states $|B^1\Pi ,v=8⟩$ and $|c^3{\Sigma }^{+},v=30⟩$ which, due to their singlet-triplet admixture, serve as an ideal bridge between predominantly $a^3{\Sigma }^{+}$ Feshbach molecules and pure $X^1{\Sigma }^{+}$ ground state molecules. We investigate their hyperfine structure and present a simple model to determine the singlet-triplet coupling of these states. Using Autler-Townes spectroscopy, we locate the rovibronic ground state of the ${}^{23}{\text{Na}}^{39}\text{K}$ molecule ($|X^1{\Sigma }^{+},v=0,N=0⟩$) and the second rotationally excited state $N=2$ to unambiguously identify the ground state. We also extract the effective transition dipole moment from the excited to the ground state. Our investigations result in a fully characterized scheme for the creation of ultracold bosonic ${}^{23}{\text{Na}}^{39}\text{K}$ ground state molecules.

References in corpus (17)

• A High Phase-Space-Density Gas of Polar Molecules
• Quantum-State Controlled Chemical Reactions of Ultracold KRb Molecules
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Creation of an ultracold gas of ground-state ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules
• Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
• Three-body interactions with cold polar molecules
• Reactions of ultracold alkali metal dimers
• Long-Lived Ultracold Molecules with Electric and Magnetic Dipole Moments
• Modeling the adiabatic creation of ultracold, polar ${}^{23}\mathrm{N}{\mathrm{a}}^{40}\mathrm{K}$ molecules
• Dipolar Collisions of Ultracold Ground-state Bosonic Molecules
• Feshbach spectroscopy and dual-species Bose-Einstein condensation of ${}^{23}\mathrm{Na}-$${}^{39}\mathrm{K}$ mixtures
• A Simple, Versatile Laser System for the Creation of Ultracold Ground State Molecules
• Predicted Landé $g$-factors for open shell diatomic molecules
• Feshbach resonances in ${}^{23}\mathrm{Na}+$${}^{39}\mathrm{K}$ mixtures and refined molecular potentials for the NaK molecule
• Multi-channel modeling and two photon coherent transfer paths in NaK

Cited by in corpus (4)

• Efficient conversion of closed-channel dominated Feshbach molecules of ${}^{23}$Na${}^{40}$K to their absolute ground state
• Quantum Many-Body Physics with Ultracold Polar Molecules: Nanostructured Potential Barriers and Interactions
• Formation of ultracold weakly bound dimers of bosonic ${}^{23}{\text{Na}}^{39}\text{K}$
• Formation of ultracold triatomic molecules by electric microwave association