Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms

Details Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms

2002-12-19

arxiv.org/abs/cond-mat/0212463v1

Science Dec 13 2002: 2179-2182

Physics

Condensed Matter

Superconductivity

5 pages. Version 2 corrected bibliography

Scientific paper

10.1126/science.1079107

We report on the observation of a highly-degenerate, strongly-interacting Fermi gas of atoms. Fermionic $^6$Li atoms in an optical trap are evaporatively cooled to degeneracy using a magnetic field to induce strong, resonant interactions. Upon abruptly releasing the cloud from the trap, the gas is observed to expand rapidly in the transverse direction while remaining nearly stationary in the axial. We interpret the expansion dynamics in terms of collisionless superfluid and collisional hydrodynamics. For the data taken at the longest evaporation times, we find that collisional hydrodynamics does not provide a satisfactory explanation, while superfluidity is plausible.

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