Ye-Ryoung Lee, Myoung-Sun Heo, Jae-Hoon Choi, Tout T. Wang, Caleb A. Christensen, Timur M. Rvachov, Wolfgang Ketterle
Fermi gases with repulsive interactions are characterized by measuring their compressibility as a function of interaction strength. The compressibility is obtained from in-trap density distributions monitored by phase contrast imaging. For interaction parameters k_F a > 0.25 fast decay of the gas prevents the observation of equilibrium profiles. For smaller interaction parameters, the results are adequately described by first-order perturbation theory. A novel phase contrast imaging method compensates for dispersive distortions of the images.
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http://arxiv.org/abs/1204.4229
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