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arXiv · 2505.08183

Observation of high partial-wave Feshbach resonances in $^{39}$K Bose-Einstein condensates

Yue Zhang·Liangchao Chen·Zekui Wang·Yazhou Wang·Pengjun Wang·Lianghui Huang·Zengming Meng·Ran Qi·Jing Zhang
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Abstract

We report the new observation of several high partial-wave (HPW) magnetic Feshbach resonances (FRs) in $^{39}$K atoms of the hyperfine substate $\left|F=1,m_{F}=-1\right\rangle$. These resonances locate at the region between two broad $s$-wave FRs from 32.6 G to 162.8 G, in which Bose-Einstein condensates (BECs) can be produced with tunable positive scattering length obtained by magnetic FRs. These HPW FRs are induced by the dipolar spin-spin interaction with s-wave in the open channel and HPW in the closed channel. Therefore, these HPW FRs have distinct characteristics in temperature dependence and loss line shape from that induced by spin-exchange interaction with HPWs in both open and closed channels. Among these resonances, one $d$-wave and two $g$-wave FRs are confirmed by the multichannel quantum-defect theory (MQDT) calculation. The HPW FRs have significant applications in many-body physics dominated by HPW pairing.

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Yue Zhang, Liangchao Chen, Zekui Wang, Yazhou Wang, Pengjun Wang, Lianghui Huang, Zengming Meng, Ran Qi, Jing Zhang. 2025-05-13. Observation of high partial-wave Feshbach resonances in $^{39}$K Bose-Einstein condensates. https://doi.org/10.1088/1367-2630%2Fadcd95

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