Resonant control of elastic collisions between ${}^{23}$Na${}^{40}$K molecules and ${}^{40}$K atoms

Abstract

We have demonstrated the resonant control of the elastic scattering cross sections in the vicinity of Feshbach resonances between ${}^{23}$Na${}^{40}$K molecules and ${}^{40}$K atoms by studying the thermalization between them. The elastic scattering cross sections vary by more than two orders of magnitude close to the resonance, and can be well described by an asymmetric Fano profile. The parameters that characterize the magnetically tunable s-wave scattering length are determined from the elastic scattering cross sections. The observation of resonantly controlled elastic scattering cross sections opens up the possibility to study strongly interacting atom-molecule mixtures and improve our understanding of the complex atom-molecule Feshbach resonances.

arXiv comment6 pages, 4 figures

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• Ultracold Sticky Collisions: Theoretical and Experimental Status
• Diatomic molecules of alkali-metal and alkaline-earth-metal atoms: interaction potentials, dipole moments, and polarizabilities
• Observation of photoassociation resonances in ultracold atom-molecule collisions
• Preparation of a quantum degenerate mixture of ${}^{23}$Na${}^{40}$K molecules and ${}^{40}$K atoms
• Symmetry breaking in sticky collisions between ultracold molecules
• Magnetic Feshbach resonances in ultracold atom-molecule collisions
• Ultracold molecular collisions in magnetic fields: Efficient incorporation of hyperfine structure in the total rotational angular momentum representation
• Cold hybrid electrical-optical ion trap
• Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture