Feshbach resonances in ultracold K(39)
C. D'Errico, M. Zaccanti, M. Fattori, G. Roati, M. Inguscio, G., Modugno, and A. Simoni
TL;DR
This paper reports the discovery of multiple Feshbach resonances in ultracold potassium-39 atoms, enabling precise control of atomic interactions and aiding future ultracold molecule experiments.
Contribution
It provides the first detailed experimental mapping of Feshbach resonances in K(39) and refines a quantum collision model for potassium isotopes.
Findings
Identified several magnetic Feshbach resonances in K(39)
Optimized a quantum collision model for potassium
Predicted magnetic-field dependence of scattering lengths
Abstract
We discover several magnetic Feshbach resonances in collisions of ultracold K(39) 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 potassium atoms and molecules.
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