Phys. Rev. Lett. 105, 123201 (2010) [4 pages]s-Wave Interaction in a Two-Species Fermi-Fermi Mixture at a Narrow Feshbach ResonanceSee Also: Erratum Received 18 June 2010; published 13 September 2010 We investigate s-wave interactions in a two-species Fermi-Fermi mixture of 6Li and 40K. We develop for this case the method of cross-dimensional relaxation and find from a kinetic model, Monte Carlo simulations, and measurements that the individual relaxation rates differ due to the mass difference. The method is applied to measure the elastic cross section at the Feshbach resonance that we previously used for the production of heteronuclear molecules. Location (B0=155.09(5) G) and width are determined for this resonance. This reveals that molecules are being produced on the atomic side of the resonance within a range related to the Fermi energies, therefore establishing the first observation of a many body effect in the crossover regime of a narrow Feshbach resonance. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.123201
DOI:
10.1103/PhysRevLett.105.123201
PACS:
34.50.Cx, 37.10.Pq, 51.10.+y, 67.85.Lm
See AlsoErratum: L. Costa, J. Brachmann, A.-C. Voigt, C. Hahn, M. Taglieber, T. W. Hänsch, and K. Dieckmann, Erratum: s-Wave Interaction in a Two-Species Fermi-Fermi Mixture at a Narrow Feshbach Resonance [Phys. Rev. Lett. 105, 123201 (2010)], Phys. Rev. Lett. 105, 269903 (2010). |
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