Dynamics of a Highly-Degenerate, Strongly-Interacting Fermi Gas of Atoms |
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Authors: | J E Thomas S L Hemmer J Kinast A Turlapov M E Gehm K M O'Hara |
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Affiliation: | 1. Department of Physics, Duke University, Durham, N.C, 27708-0305, USA 2. National Institute of Standards and Technology, Gaithersburg, MD
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Abstract: | We use all-optical methods to produce a highly-degenerate, Fermi gas of 6Li atoms near a Feshbach resonance, where strong interactions are predicted. In this regime, the zero-energy scattering length is larger than the interparticle spacing, and both the mean field energy and the collision rate take on universal forms as a consequence of unitarity and many-body interactions. Our experiments study universal hydrodynamic expansion of the gas and universal mean field interactions. By measuring the cloud radii of the trapped gas, we determine a universal parameter for strongly interacting two-component Fermi systems, the ratio of the mean field energy to the kinetic energy. |
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