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

Phys Rev Lett

Physics Division, School of Science and Technology, University of Camerino, I-62032 Camerino (MC), Italy.

Published: February 2012

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.

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http://dx.doi.org/10.1103/PhysRevLett.108.080401DOI Listing

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