Quantitative analysis of losses close to a d-wave open-channel Feshbach resonance in Potassium 39

Abstract

We study atom losses associated to a previously unreported magnetic Feshbach resonance in potassium 39. This resonance is peculiar in that it presents $d$-wave character both in the open and in the closed channels, directly coupled by the dominant spin-exchange interaction. The losses associated to a $d$-wave open-channel resonance present specific signatures such as strong temperature dependance and anisotropic line shapes. The resonance strength and position depend on the axial projection of the orbital angular momentum of the system and are extracted from rigorous multichannel calculations. A two-step model, with an intermediate collision complex being ejected from the trap after collisions with free atoms, permits to reproduce the observed dependance of the loss rate as a function of temperature and magnetic field.

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Cited by in corpus (9)

• Feshbach resonances in $p$-wave three-body recombination within Fermi-Fermi mixtures of open-shell ${}^6$Li and closed-shell ${}^{173}$Yb atoms
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• Exploring ultracold collisions in ${}^6$Li-${}^{53}$Cr Fermi mixtures: Feshbach resonances and scattering properties of a novel alkali-transition metal system
• Beyond Born-Oppenheimer approximation in ultracold atomic collisions
• Emergent s-wave interactions between identical fermions in quasi-one-dimensional geometries
• Exploring atom-ion Feshbach resonances below the s-wave limit
• Emergent $s$-wave interactions in orbitally active quasi-two-dimensional Fermi gases
• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates
• Three-body recombination near the d-wave resonance in ultracold ${}^{85}$Rb\,-${}^{87}$Rb mixtures