Evidence for Superfluidity in a Resonantly Interacting Fermi Gas

Details Evidence for Superfluidity in a Resonantly Interacting Fermi Gas Evidence for Superfluidity in a Resonantly Interacting Fermi Gas

2004-03-21

arxiv.org/abs/cond-mat/0403540v2

Phys. Rev. Lett. 92, 150402 (2004)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, ReVTeX4, 2 eps figs. Resubmitted to PRL in response to referees' comments. Title and abstract changed. Corrected erro

Scientific paper

10.1103/PhysRevLett.92.150402

We observe collective oscillations of a trapped, degenerate Fermi gas of $^6$Li atoms at a magnetic field just above a Feshbach resonance, where the two-body physics does not support a bound state. The gas exhibits a radial breathing mode at a frequency of 2837(05) Hz, in excellent agreement with the frequency of $\nu_H\equiv\sqrt{10\nu_x\nu_y/3}=2830(20)$ Hz predicted for a {\em hydrodynamic} Fermi gas with unitarity limited interactions. The measured damping times and frequencies are inconsistent with predictions for both the collisionless mean field regime and for collisional hydrodynamics. These observations provide the first evidence for superfluid hydrodynamics in a resonantly interacting Fermi gas.

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