Evidence for Superfluidity in a Resonantly Interacting Fermi Gas
Abstract
We observe collective oscillations of a trapped, degenerate Fermi gas of 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 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.
Cite
@article{arxiv.cond-mat/0403540,
title = {Evidence for Superfluidity in a Resonantly Interacting Fermi Gas},
author = {J. Kinast and S. L. Hemmer and M. E. Gehm and A. Turlapov and J. E. Thomas},
journal= {arXiv preprint arXiv:cond-mat/0403540},
year = {2009}
}
Comments
5 pages, ReVTeX4, 2 eps figs. Resubmitted to PRL in response to referees' comments. Title and abstract changed. Corrected error in Table 1, atom numbers for 0.33 TF and 0.5 TF data were interchanged. Corrected typo in ref 3. Added new figure of damping time versus temperature