Feshbach Resonances in Rubidium 87: Precision Measurement and Analysis

Abstract

More than 40 Feshbach resonances in rubidium 87 are observed in the magnetic field range between 0.5 and 1260 gauss for various spin mixtures in the lower hyperfine ground state. The Feshbach resonances are observed by monitoring the atom loss, and their positions are determined with an accuracy of 30 mG. In a detailed analysis, the resonances are identified and an improved set of model parameters for the rubidium interatomic potential is deduced. The elastic width of the broadest resonance at 1007 G is predicted to be significantly larger than the magnetic field resolution of the apparatus. This demonstrates the potential for applications based on tuning the scattering length.

Feshbach spectroscopy and scattering properties of ultracold Li + Na mixtures

“…Second, the effective coupling between singlet and triplet states is very small, indicated by |a s − a t | r 0 . A similar situation can be found in homonuclear 87 Rb [39], where the narrowness of the Feshbach resonances and the smallness of the loss rates can be traced back to nonresonant and similar values of a s and a t [40].…”

Feshbach spectroscopy of aK−Rbatomic mixture

“…Feshbach resonances have been deeply investigated in homonuclear systems, and recently observed also in some heteronuclear mixtures [12,13,14]. However, accurate Feshbach spectroscopy, has been performed so far only on homonuclear systems [15,16,17]. We report here an extensive experimental study of Feshbach resonances in a 40 K-87 Rb mixture.…”

Dual-species Bose-Einstein condensate ofRb87andCs133McCarron1, Cho2, Jenkin3 et al. 2011Phys. Rev. A248122680View full textAdd to dashboardCite

“…Both species have been separately condensed and the intraspecies two-body interactions are now well understood [24,25]. Numerous interspecies Feshbach resonances have been observed [26], permitting, in principle, the control of the interspecies interactions and the creation of RbCs Feshbach molecules.…”