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Observation of momentum-induced broadening of width in narrow Feshbach resonances of ultracold 133Cs atoms |
| Zhennan Liu(刘震南)1, Hongxing Zhao(赵宏星)1, Yunfei Wang(王云飞)1,†, Yuqing Li(李玉清)1,2,‡, Jizhou Wu(武寄洲)1,2, Wenliang Liu(刘文良)1,2, Peng Li(李鹏)3, Yongming Fu(付永明)3, Liantuan Xiao(肖连团)1,2, Jie Ma(马杰)1,2, and Suotang Jia(贾锁堂)1,2 |
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;
3 College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China |
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Abstract Interactions between atoms in ultracold quantum gases play an important role in the study of the quantum simulation of many-body physics. Feshbach resonance is a versatile tool to control atomic interactions, where the atom-loss spectra are widely used to characterize Feshbach resonances of various atomic species. Here, we report the experimental observation of momentum-induced broadening of widths in atom-loss spectra of narrow $^{133}$Cs Feshbach resonances. We drive Bragg excitation to kick the Bose-Einstein condensate of Cs atoms in a cigar-shaped optical trap, and measure the atom-loss spectra of narrow Feshbach resonances of moving ultracold atoms near the magnetic fields 19.84 G and 47.97 G. We show that the widths of the atom-loss spectra are broadened for the atoms with the momenta of 2$\hbar k$ and 4$\hbar k$, and even observe splitting in the Feshbach resonance of the atoms with momentum 4$\hbar k$. Our work may open the way for exploring the interesting physical phenomena arising from the collective velocity of colliding atoms that have been ignored in general.
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Received: 11 September 2024
Revised: 03 November 2024
Accepted manuscript online: 15 November 2024
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PACS:
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37.10.De
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(Atom cooling methods)
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67.85.Hj
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(Bose-Einstein condensates in optical potentials)
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| Fund: This research is funded by the National Key Research and Development Program of China (Grant No. 2022YFA1404201), the National Natural Science Foundation of China (Grant Nos. 62020106014, 92165106, 62175140, 12074234, and 11974331), and the Applied Basic Research Project of Shanxi Province, China (Grant No. 202203021224001). |
Corresponding Authors:
Yunfei Wang, Yuqing Li
E-mail: wangyf@sxu.edu.cn;lyqing.2006@163.com
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Cite this article:
Zhennan Liu(刘震南), Hongxing Zhao(赵宏星), Yunfei Wang(王云飞), Yuqing Li(李玉清), Jizhou Wu(武寄洲), Wenliang Liu(刘文良), Peng Li(李鹏), Yongming Fu(付永明), Liantuan Xiao(肖连团), Jie Ma(马杰), and Suotang Jia(贾锁堂) Observation of momentum-induced broadening of width in narrow Feshbach resonances of ultracold 133Cs atoms 2025 Chin. Phys. B 34 023701
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