Scientific Results

Feshbach resonances in cesium at ultralow static magnetic fields

Year: 2012

Authors: Papoular D.J., Bize S., Clairon A., Marion H., Kokkelmans SJJMF., Shlyapnikov GV.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy,
Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Université Paris-Sud, F-91405, Orsay, France;
LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, F-75014 Paris, France;
Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands;
Van der Waals–Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands

Abstract: We have observed Feshbach resonances for Cs-133 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.

Journal/Review: PHYSICAL REVIEW A

Volume: 86 (4)      Pages from: 040701  to: 040701

More Information: Publisher: AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
DOI: 10.1103/PhysRevA.86.040701
KeyWords: BOSE-EINSTEIN CONDENSATION; ULTRACOLD COLLISIONS; FREQUENCY STANDARD; FOUNTAIN; GASES
DOI: 10.1103/PhysRevA.86.040701

Citations: 4
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