Formation of ultracold ${}^{39}$K${}^{133}$Cs Feshbach molecules

Abstract

We report the creation of an ultracold gas of bosonic ${}^{39}$K${}^{133}$Cs molecules. We first demonstrate a cooling strategy relying on sympathetic cooling of ${}^{133}$Cs to produce an ultracold mixture. From this mixture, weakly bound molecules are formed using a Feshbach resonance at 361.7 G. The molecular gas contains $7.6(10)\times 10^3$ molecules with a lifetime of about 130 ms, limited by two-body decay. We perform Feshbach spectroscopy to observe several new interspecies resonances and characterize the bound state used for magnetoassociation. Finally, we fit the combined results to obtain improved K-Cs interaction potentials. This provides a good starting point for the creation of ultracold samples of ground-state ${}^{39}$K${}^{133}$Cs molecules.

References in corpus (31)

• A High Phase-Space-Density Gas of Polar Molecules
• Observation of Bose-Einstein Condensation of Molecules
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Quantum Gas of Deeply Bound Ground State Molecules
• Ultracold heteronuclear molecules in a 3D optical lattice
• Reactions of ultracold alkali metal dimers
• Dual-Species Bose-Einstein Condensate of ${}^{87}$Rb and ${}^{133}$Cs
• 39-K Bose-Einstein condensate with tunable interactions
• Ultracold Fermionic Feshbach Molecules of ${}^{23}$Na${}^{40}$K
• Ultracold Heteronuclear Fermi-Fermi Molecules
• Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas
• Observation of Bose-Einstein Condensation of Dipolar Molecules
• Feshbach resonances in ultracold atomic and molecular collisions: threshold behaviour and suppression of poles in scattering lengths
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Quantum Engineering of a Low-Entropy Gas of Heteronuclear Bosonic Molecules in an Optical Lattice
• Universal van der Waals Physics for Three Ultracold Atoms
• Formation of Ultracold NaRb Feshbach Molecules
• Sub-millisecond Entanglement and iSWAP Gate between Molecular Qubits
• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Two-axis twisting using Floquet-engineered XYZ spin models with polar molecules
• Diatomic molecules of alkali-metal and alkaline-earth-metal atoms: interaction potentials, dipole moments, and polarizabilities
• Observation of generalized t-J spin dynamics with tunable dipolar interactions
• Feshbach spectroscopy of an ultracold mixture of ${}^{85}$Rb and ${}^{133}$Cs
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• A High Phase-Space Density Gas of NaCs Feshbach Molecules
• Feshbach resonances, molecular bound states and prospects of ultracold molecule formation in mixtures of ultracold K and Cs
• Feshbach Loss Spectroscopy in an Ultracold ${}^{23}$Na and ${}^{40}$K Mixture
• Characterizing Feshbach resonances in ultracold scattering calculations
• Preparation of a quantum degenerate mixture of ${}^{23}$Na${}^{40}$K molecules and ${}^{40}$K atoms
• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers