Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.123201
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Funding
- German Science Foundation (DFG) via Research Unit [FOR801]
- Munich Center for Advanced Photonics
- Max-Planck Foundation
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We investigate s-wave interactions in a two-species Fermi-Fermi mixture of (6)Li and (40)K. 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 (B(0) = 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.
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