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Observation of Feshbach resonances between alkali and closed-shell atoms.

Barbé, V. and Ciamei, A. and Pasquiou, B. and Reichsöllner, L. and Schreck, F. and Żuchowski, P. S. and Hutson, J. M. (2018) 'Observation of Feshbach resonances between alkali and closed-shell atoms.', Nature physics., 14 . pp. 881-884.


Magnetic Feshbach resonances allow control of the interactions between ultracold atoms1. They are an invaluable tool in studies of few-body and many-body physics2,3, and can be used to convert pairs of atoms into molecules4,5 by ramping an applied magnetic field across a resonance. Molecules formed from pairs of alkali atoms have been transferred to low-lying states, producing dipolar quantum gases6. There is great interest in making molecules formed from an alkali atom and a closed-shell atom such as ground-state Sr or Yb. Such molecules have both a strong electric dipole and an electron spin; they will open up new possibilities for designing quantum many-body systems7,8, and for tests of fundamental symmetries9. The crucial first step is to observe Feshbach resonances in the corresponding atomic mixtures. Very narrow resonances have been predicted theoretically10,11,12, but until now have eluded observation. Here we present the observation of magnetic Feshbach resonances of this type, for an alkali atom, Rb, interacting with ground-state Sr.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Date accepted:09 May 2018
Date deposited:25 May 2018
Date of first online publication:11 June 2018
Date first made open access:11 December 2018

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