Density and spin response of a strongly interacting Fermi gas in the attractive and quasirepulsive regime

Recent experimental advances in ultracold Fermi gases allow for exploring response functions under different dynamical conditions. In particular, the issue of obtaining a "quasirepulsive" regime starting from a Fermi gas with an attractive interparticle interaction while avoiding the forma...

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Bibliographic Details
Published in:Physical review letters 2012-02, Vol.108 (8), p.080401-080401, Article 080401
Main Authors: Palestini, F, Pieri, P, Strinati, G C
Format: Article
Language:English
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Summary:Recent experimental advances in ultracold Fermi gases allow for exploring response functions under different dynamical conditions. In particular, the issue of obtaining a "quasirepulsive" regime starting from a Fermi gas with an attractive interparticle interaction while avoiding the formation of the two-body bound state is currently debated. Here, we provide a calculation of the density and spin response for a wide range of temperature and coupling both in the attractive and quasirepulsive regime, whereby the system is assumed to evolve nonadiabatically toward the "upper branch" of the Fermi gas. A comparison is made with the available experimental data for these two quantities.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.080401