Association of ultracold double-species bosonic molecules

Abstract

We report on the creation of heterospecies bosonic molecules, associated from an ultracold Bose-Bose mixture of 41K and 87Rb, by using a resonantly modulated magnetic field close to two Feshbach resonances. We measure the binding energy of the weakly bound molecular states versus the Feshbach field and compare our results to theoretical predictions. We observe the broadening and asymmetry of the association spectrum due to thermal distribution of the atoms, and a frequency shift occurring when the binding energy depends nonlinearly on the Feshbach field. A simple model is developed to quantitatively describe the association process. Our work marks an important step forward in the experimental route towards Bose-Einstein condensates of dipolar molecules.

5 pages, 4 figures

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• Ultracold Heteronuclear Fermi-Fermi Molecules
• Scattering in Mixed Dimensions with Ultracold Gases
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• Formation of Ultracold NaRb Feshbach Molecules
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• A High Phase-Space Density Gas of NaCs Feshbach Molecules
• Quantum phase transitions in Bose-Einstein condensates from a Bethe ansatz perspective
• Collisional and molecular spectroscopy in an ultracold Bose-Bose mixture
• Enhanced association and dissociation of heteronuclear Feshbach molecules in a microgravity environment
• Association of Atoms into Universal Dimers using an Oscillating Magnetic Field
• Optically trapped Feshbach molecules of fermionic 161Dy and 40K
• Controlling the interactions in a cold atom quantum impurity system
• Synthetic gauge field in two interacting ultracold atomic gases without an optical lattice
• Quantum Phase Transitions in Bosonic Heteronuclear Pairing Hamiltonians
• Multipole Analysis of Radio-Frequency Reactions in Ultra-Cold Atoms
• Efficiency for preforming molecules from mixtures of light Fermi and heavy Bose atoms in optical lattices: the strong-coupling-expansion method
• Feshbach molecule formation through an oscillating magnetic field: subharmonic resonances
• Observation of coherent oscillations in association of dimers from a thermal gas of ultracold atoms
• Resonant Floquet Scattering of Ultracold Atoms
• Comparison between the numerical solutions and the Thomas-Fermi approximation for atomic-molecular Bose-Einstein condensates
• Delta-Kick Collimation of Heteronuclear Feshbach Molecules