A High Phase-Space Density Gas of NaCs Feshbach Molecules

Abstract

We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5) G. We characterize the Feshbach resonance using bound state spectroscopy, in conjunction with a coupled-channel calculation. By varying the temperature and atom numbers of the initial atomic mixtures, we demonstrate the association of NaCs gases over a wide dynamic range of molecule numbers and temperatures, reaching 70 nK for our coldest systems and a phase-space density near 0.1. This is an important stepping-stone for the creation of degenerate gases of strongly dipolar NaCs molecules in their absolute ground state.

6 pages, 5 figures, supplemental material

References in corpus (20)

• A High Phase-Space-Density Gas of Polar Molecules
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of Bose-Einstein Condensation of Molecules
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Weakly bound dimers of fermionic atoms
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Ultracold heteronuclear molecules in a 3D optical lattice
• Quantum transport through a Tonks-Girardeau gas
• Ultracold Fermionic Feshbach Molecules of ${}^{23}$Na${}^{40}$K
• Ultracold Heteronuclear Fermi-Fermi Molecules
• Assembly of a rovibrational ground state molecule in an optical tweezer
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Association of ultracold double-species bosonic molecules
• Quantum Engineering of a Low-Entropy Gas of Heteronuclear Bosonic Molecules in an Optical Lattice
• Dissociation of ultracold molecules with Feshbach resonances
• Adimensional theory of shielding in ultracold collisions of dipolar rotors
• Formation of Ultracold NaRb Feshbach Molecules
• Trapping of ultracold polar molecules with a Thin Wire Electrostatic Trap

Cited by in corpus (2)

• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K