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Feshbach resonances in cesium at ultralow static magnetic fields

D. J. Papoular, S. Bize, A. Clairon, H. Marion, S. J. J. M. F. Kokkelmans, and G. V. Shlyapnikov
Phys. Rev. A 86, 040701(R) – Published 24 October 2012

Abstract

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.

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  • Received 11 May 2012

DOI:https://doi.org/10.1103/PhysRevA.86.040701

©2012 American Physical Society

Authors & Affiliations

D. J. Papoular1,2, S. Bize3, A. Clairon3, H. Marion3, S. J. J. M. F. Kokkelmans4, and G. V. Shlyapnikov2,5

  • 1INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
  • 2Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Université Paris-Sud, F-91405, Orsay, France
  • 3LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, F-75014 Paris, France
  • 4Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands
  • 5Van der Waals–Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands

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Issue

Vol. 86, Iss. 4 — October 2012

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