Observation of high partial-wave Feshbach resonances in $^{39}$K Bose-Einstein condensates
Abstract
We report the new observation of several high partial-wave (HPW) magnetic Feshbach resonances (FRs) in K atoms of the hyperfine substate . These resonances locate at the region between two broad -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 -wave and two -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.
Keywords
Cite
@article{arxiv.2505.08183,
title = {Observation of high partial-wave Feshbach resonances in $^{39}$K Bose-Einstein condensates},
author = {Yue Zhang and Liangchao Chen and Zekui Wang and Yazhou Wang and Pengjun Wang and Lianghui Huang and Zengming Meng and Ran Qi and Jing Zhang},
journal= {arXiv preprint arXiv:2505.08183},
year = {2026}
}