Abstract
We discover several magnetic Feshbach resonances in collisions of ultracold 39K atoms, by studying atom losses and molecule formation. Accurate determination of the magnetic-field resonance locations allows us to optimize a quantum collision model for potassium isotopes. We employ the model to predict the magnetic-field dependence of scattering lengths and of near-threshold molecular levels. Our findings will be useful to plan future experiments on ultracold 39K atoms and molecules.
Highlights
We discover several magnetic Feshbach resonances in collisions of ultracold 39K atoms, by studying atom losses and molecule formation
Control of the isotropic interaction in ultracold atomic gases [1, 2] is revealing itself as a fundamental tool to explore a variety of fundamental phenomena
There is always a range of magnetic fields near resonance where the amplitude of the molecular state is almost entirely transferred to the open background channel [34], which is not represented by the same quantum numbers as the molecule
Summary
Control of the isotropic interaction in ultracold atomic gases [1, 2] is revealing itself as a fundamental tool to explore a variety of fundamental phenomena. Homonuclear Feshbach resonances have been successfully used to convert atomic gases in molecular BoseEinstein condensates [6], to produce strongly correlated quantum phases [7, 8] and to observe Efimov trimer states [9]. We discover several resonances in three different hyperfine states and measure their magnetic-field location by observing onresonance enhancement of inelastic three-body losses and molecule formation. Each hyperfine state of interest presents at least one broad Feshbach resonance which can be used to tune with high accuracy the interaction in a 39K Bose-Einstein condensate [21]. Knowledge of molecular parameters is essential for understanding experiments performed in the strongly interacting regime It is important for implementing schemes of molecules formation and for the interpretation of their properties
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