Correlations and pair formation in a repulsively interacting Fermi gas

A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scatte...

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Bibliographic Details
Published in:Physical review letters 2012-06, Vol.108 (24), p.240404-240404, Article 240404
Main Authors: Sanner, Christian, Su, Edward J, Huang, Wujie, Keshet, Aviv, Gillen, Jonathon, Ketterle, Wolfgang
Format: Article
Language:English
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Summary:A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scattering length. Over a wide range of interaction strengths a rapid decay into bound pairs is observed over times on the order of 10ℏ/E(F), preventing the study of equilibrium phases of strongly repulsive fermions. Our work suggests that a Fermi gas with strong short-range repulsive interactions does not undergo a ferromagnetic phase transition.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.240404