Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915634361663488 |
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| author | Su, Zhen Shou, Tong-Hui Yang, Huan Cao, Jin Wang, Bo-Yuan Xie, Ting Rui, Jun Zhao, Bo Pan, Jian-Wei |
| author_facet | Su, Zhen Shou, Tong-Hui Yang, Huan Cao, Jin Wang, Bo-Yuan Xie, Ting Rui, Jun Zhao, Bo Pan, Jian-Wei |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06772 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture Su, Zhen Shou, Tong-Hui Yang, Huan Cao, Jin Wang, Bo-Yuan Xie, Ting Rui, Jun Zhao, Bo Pan, Jian-Wei Quantum Gases Atomic Physics 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. |
| title | Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture |
| topic | Quantum Gases Atomic Physics |
| url | https://arxiv.org/abs/2511.06772 |