Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture
Abstract
We report the observation of a broad magnetic Feshbach resonance with a large background scattering length in an ultracold fermionic mixture of NaK molecules and 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.
Keywords
Cite
@article{arxiv.2511.06772,
title = {Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture},
author = {Zhen Su and Tong-Hui Shou and Huan Yang and Jin Cao and Bo-Yuan Wang and Ting Xie and Jun Rui and Bo Zhao and Jian-Wei Pan},
journal= {arXiv preprint arXiv:2511.06772},
year = {2025}
}
Comments
8 pages, 6 figures