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arXiv · 2511.06772

Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture

Zhen Su·Tong-Hui Shou·Huan Yang·Jin Cao·Bo-Yuan Wang·Ting Xie·Jun Rui·Bo Zhao·Jian-Wei Pan
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Abstract

We report the observation of a broad magnetic Feshbach resonance with a large background scattering length in an ultracold fermionic mixture of $^{23}$Na$^{40}$K molecules and $^{40}$K atoms, with both species prepared in their lowest hyperfine states. The Feshbach resonance is characterized by measuring resonantly enhanced loss rates and elastic scattering cross sections via cross-species thermalization. The large background scattering length can drive the atom-molecule mixture into the hydrodynamic regime when the magnetic field is far from the resonance. We observe that the center-of-mass motions of the atoms and molecules are phase-locked and oscillate with a common frequency due to hydrodynamic drag effects. This broad atom-molecule Feshbach resonance with its large background scattering length opens up a new avenue towards studying strongly interacting fermionic gases with mass imbalance.

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Zhen Su, Tong-Hui Shou, Huan Yang, Jin Cao, Bo-Yuan Wang, Ting Xie, Jun Rui, Bo Zhao, Jian-Wei Pan. 2025-11-10. Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture. https://doi.org/10.1103/95nd-4tzv

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