KRb Feshbach Resonances: Modeling the interatomic potential

Abstract

We have observed 28 heteronuclear Feshbach resonances in 10 spin combinations of the hyperfine ground states of a 40K 87Rb mixture. The measurements were performed by observing the loss rates from an atomic mixture at magnetic fields between 0 and 700 G. This data was used to significantly refine an interatomic potential derived from molecular spectroscopy, yielding a highly consistent model of the KRb interaction. Thus, the measured resonances can be assigned to the corresponding molecular states. In addition, this potential allows for an accurate calculation of the energy differences between highly excited levels and the rovibrational ground level. This information is of particular relevance for the formation of deeply bound heteronuclear molecules. Finally, the model is used to predict Feshbach resonances in mixtures of 87Rb combined with 39K or 41K.

4 pages, 3 figures

References in corpus (15)

• A toolbox for lattice spin models with polar molecules
• Observation of dipole-dipole interaction in a degenerate quantum gas
• Quo vadis, cold molecules? - Editorial review
• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms
• Ultracold heteronuclear molecules in a 3D optical lattice
• Observation of Heteronuclear Feshbach Resonances in a Bose-Fermi Mixture
• Observation of molecules produced from a Bose-Einstein condensate
• 39-K Bose-Einstein condensate with tunable interactions
• Coherent optical transfer of Feshbach molecules to a lower vibrational state
• Tuning of heteronuclear interactions in a quantum-degenerate Fermi-Bose mixture
• Long-lived Feshbach molecules in a 3D optical lattice
• Feshbach spectroscopy of a K-Rb atomic mixture
• Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas
• Fractional Quantum Hall States in Ultracold Rapidly Rotating Dipolar Fermi Gases
• UV light-induced atom desorption for large rubidium and potassium magneto-optical traps

Cited by in corpus (26)

• Feshbach Resonances in Ultracold Gases
• Observation of many-body localization of interacting fermions in a quasi-random optical lattice
• Double species condensate with tunable interspecies interactions
• Observation of heteronuclear atomic Efimov resonances
• Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice
• Observation of interspecies Feshbach resonances in an ultracold Rb-Cs mixture
• Self-trapping of impurities in Bose-Einstein condensates: Strong attractive and repulsive coupling
• Potassium ground state scattering parameters and Born-Oppenheimer potentials from molecular spectroscopy
• Feshbach resonances in mixtures of ultracold ${}^6$Li and ${}^{87}$Rb gases
• Accurate near-threshold model for ultracold KRb dimers from interisotope Feshbach spectroscopy
• Simulating dense QCD matter with ultracold atomic boson-fermion mixtures
• Feshbach resonances in an ultracold ${}^7$Li and ${}^{87}$Rb mixture
• Independent Control of Scattering Lengths in Multicomponent Quantum Gases
• Ultracold molecules from ultracold atoms: a case study with the KRb molecule
• Quantum Gas Mixtures and Dual-Species Atom Interferometry in Space
• Radio frequency association of heteronuclear Feshbach molecules
• Broad Feshbach resonances in ultracold alkali-metal systems
• Isotopic shift of atom-dimer Efimov resonances in K-Rb mixtures: Critical effect of multichannel Feshbach physics
• Transport of a quantum degenerate heteronuclear Bose-Fermi mixture in a harmonic trap
• Collisional and molecular spectroscopy in an ultracold Bose-Bose mixture
• Enhanced association and dissociation of heteronuclear Feshbach molecules in a microgravity environment
• Isotope shift and hyperfine splitting of the $4s\to 5p$ transition in potassium
• Interaction dependent temperature effects in Bose-Fermi mixtures in optical lattices
• p-Wave stabilization of three-dimensional Bose-Fermi solitons
• Response functions in multicomponent Luttinger liquids
• Bose-Einstein condensation and density collapse in a weakly coupled boson-fermion mixture