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 (52)

• A High Phase-Space-Density Gas of Polar Molecules
• Observation of resonance condensation of fermionic atom pairs
• Quantum computation with trapped polar molecules
• Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
• A toolbox for lattice spin models with polar molecules
• Production of cold molecules via magnetically tunable Feshbach resonances
• Observation of Bose-Einstein Condensation of Molecules
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Creation of ultracold molecules from a Fermi gas of atoms
• 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
• A Fermi Degenerate Gas of Polar Molecules
• 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
• Dynamical polarizability of atoms in arbitrary light fields: general theory and application to cesium
• Ultracold Fermionic Feshbach Molecules of ${}^{23}$Na${}^{40}$K
• Creation of a low-entropy quantum gas of polar molecules in an optical lattice
• Ultracold Heteronuclear Fermi-Fermi Molecules
• High-precision calculations of van der Waals coefficients for heteronuclear alkali-metal dimers
• Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas
• Observation of magnetically tunable Feshbach resonances in ultracold ${}^{23}$Na${}^{40}$K+${}^{40}$K collisions
• Towards the production of ultracold ground-state RbCs molecules: Feshbach resonances, weakly bound states, and coupled-channel model
• Observation of Bose-Einstein Condensation of Dipolar Molecules
• MOLSCAT: a program for non-reactive quantum scattering calculations on atomic and molecular collisions
• 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
• Formation of Ultracold Fermionic NaLi Feshbach Molecules
• Quantum Engineering of a Low-Entropy Gas of Heteronuclear Bosonic Molecules in an Optical Lattice
• Universal van der Waals Physics for Three Ultracold Atoms
• Quantum interference-enhanced deep sub-Doppler cooling of 39 K atoms in gray molasses
• Formation of Ultracold NaRb Feshbach Molecules
• BOUND and FIELD: programs for calculating bound states of interacting pairs of atoms and molecules
• Sub-millisecond Entanglement and iSWAP Gate between Molecular Qubits
• A new quantum gas apparatus for ultracold mixtures of K and Cs and KCs ground-state molecules
• Direct evaporative cooling of 39K atoms to Bose-Einstein condensation
• 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
• Beyond Born-Oppenheimer approximation in ultracold atomic collisions
• 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
• Formation of ultracold weakly bound dimers of bosonic ${}^{23}{\text{Na}}^{39}\text{K}$
• Ultracold collisions of Cs in excited hyperfine and Zeeman states
• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers