Broad Feshbach Resonance in the Li6K40 Mixture

T. G. Tiecke, M. R. Goosen, A. Ludewig, S. D. Gensemer, S. Kraft, S. J. J. M. F. Kokkelmans, and J. T. M. Walraven
Phys. Rev. Lett. 104, 053202 – Published 3 February 2010

Abstract

We study the widths of interspecies Feshbach resonances in a mixture of the fermionic quantum gases Li6 and K40. We develop a model to calculate the width and position of all available Feshbach resonances for a system. Using the model, we select the optimal resonance to study the Li6/K40 mixture. Experimentally, we obtain the asymmetric Fano line shape of the interspecies elastic cross section by measuring the distillation rate of Li6 atoms from a potassium-rich Li6/K40 mixture as a function of magnetic field. This provides us with the first experimental determination of the width of a resonance in this mixture, ΔB=1.5(5)G. Our results offer good perspectives for the observation of universal crossover physics using this mass-imbalanced fermionic mixture.

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  • Received 18 August 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.053202

©2010 American Physical Society

Authors & Affiliations

T. G. Tiecke1, M. R. Goosen2, A. Ludewig1, S. D. Gensemer1,*, S. Kraft1,†, S. J. J. M. F. Kokkelmans2, and J. T. M. Walraven1

  • 1van der Waals-Zeeman Institute of the University of Amsterdam, Valckenierstraat 65, 1018 XE, The Netherlands
  • 2Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • *Present address: Ethel Walker School, 230 Bushy Hill Road, Simsbury, CT 06070, USA.
  • Present address: Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany.

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Vol. 104, Iss. 5 — 5 February 2010

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