Feshbach resonances in cesium at ultralow static magnetic fields

D.J. Papoular, S. Bize, A. Clairon, H. Marion, S.J.J.M.F. Kokkelmans, G.V. Shlyapnikov

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We have observed Feshbach resonances for 133Cs atoms in two different hyperfine states at static magnetic fields of a few milligauss. These resonances are unusual for two main reasons. First, they are the lowest static-field resonances investigated up to now, and we explain their multipeak structure in these ultralow fields. Second, they are robust with respect to temperature effects. We have measured them using an atomic fountain clock and reproduced them using coupled-channels calculations, which are in excellent agreement with our measurements. We show that these are s-wave resonances due to a very weakly bound state of the triplet molecular Hamiltonian. We also describe a model explaining their asymmetric shape in the regime where the kinetic energy dominates over the coupling strength.
Original languageEnglish
Article number040701
Pages (from-to)1-5
Number of pages5
JournalPhysical Review A : Atomic, Molecular and Optical Physics
Issue number4
Publication statusPublished - 2012


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