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APS » Journals » Phys. Rev. Lett. » Volume 104 » Issue 5
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Phys. Rev. Lett. 104, 053202 (2010) [4 pages]

Broad Feshbach Resonance in the 6Li-40K Mixture

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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

Received 18 August 2009; published 3 February 2010

We study the widths of interspecies Feshbach resonances in a mixture of the fermionic quantum gases 6Li and 40K. 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 6Li/40K mixture. Experimentally, we obtain the asymmetric Fano line shape of the interspecies elastic cross section by measuring the distillation rate of 6Li atoms from a potassium-rich 6Li/40K 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.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.053202
DOI:
10.1103/PhysRevLett.104.053202
PACS:
34.50.-s, 05.30.Fk, 67.85.-d

*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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