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Broad universal Feshbach resonances in the chaotic spectrum of dysprosium atoms

T. Maier, I. Ferrier-Barbut, H. Kadau, M. Schmitt, M. Wenzel, C. Wink, T. Pfau, K. Jachymski, and P. S. Julienne
Phys. Rev. A 92, 060702(R) – Published 14 December 2015
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Abstract

We report on the observation of weakly bound dimers of bosonic dysprosium with a strong universal s-wave halo character, associated with broad magnetic Feshbach resonances. These states surprisingly decouple from the chaotic background of narrow resonances, persisting across many such narrow resonances. In addition they show the highest reported magnetic moment μ20μB of any ultracold molecule. We analyze our findings using a coupled-channel theory taking into account the short range van der Waals interaction and a correction due to the strong dipole moment of dysprosium. We are able to extract the scattering length as a function of magnetic field associated with these resonances and obtain a background scattering length abg=91(16)a0. These results offer prospects of a tunability of the interactions in dysprosium, which we illustrate by observing the saturation of three-body losses.

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  • Received 5 June 2015

DOI:https://doi.org/10.1103/PhysRevA.92.060702

©2015 American Physical Society

Authors & Affiliations

T. Maier1, I. Ferrier-Barbut1,*, H. Kadau1, M. Schmitt1, M. Wenzel1, C. Wink1, T. Pfau1, K. Jachymski2, and P. S. Julienne3

  • 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • 2Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  • 3Joint Quantum Institute, University of Maryland and National Institute of Standards and Technology, College Park, Maryland 20742, USA

  • *Corresponding author: i.ferrier-barbut@physik.uni-stuttgart.de

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Issue

Vol. 92, Iss. 6 — December 2015

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