Compressibility of an Ultracold Fermi Gas with Repulsive Interactions

Details Compressibility of an Ultracold Fermi Gas with Repulsive Interactions Compressibility of an Ultracold Fermi Gas with Repulsive Interactions

2012-04-19

arxiv.org/abs/1204.4229v1

Physics

Condensed Matter

Quantum Gases

7 pages, 5 figures

Scientific paper

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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