Resonant Control of Elastic Collisions between 23Na40K Molecules and 40K Atoms

We have demonstrated the resonant control of the elastic scattering cross sections in the vicinity of Feshbach resonances between (NaK)-Na-23-K-40 molecules and K-40 atoms by studying the thermalization between them. The elastic scattering cross sections vary by more than 2 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.

Automated summary

We have demonstrated the resonant control of elastic scattering cross sections near Feshbach resonances between (NaK)-Na-23-K-40 molecules and K-40 atoms by studying their thermalization. The scattering cross sections show a variation of more than 2 orders of magnitude near the resonance, and can be accurately described by an asymmetric Fano profile. This observation opens up possibilities for studying strongly interacting atom-molecule mixtures and improving our understanding of complex atom-molecule Feshbach resonances.