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 ${}^{39}$K atoms of the hyperfine substate $|F=1,m_F=-1⟩$. 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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