Density and spin response of a strongly-interacting Fermi gas in the attractive and quasi-repulsive regime

Details Density and spin response of a strongly-interacting Fermi gas in the attractive and quasi-repulsive regime Density and spin response of a strongly-interacting Fermi gas in the attractive and quasi-repulsive regime

2012-01-19

arxiv.org/abs/1201.4035v1

Phys. Rev. Lett. 108, 080401 (2012)

Physics

Condensed Matter

Quantum Gases

8 pages, 7 figures, to appear on Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.108.080401

Recent experimental advances in ultra-cold Fermi gases allow for exploring response functions under different dynamical conditions. In particular, the issue of obtaining a "quasi-repulsive" regime starting from a Fermi gas with an attractive inter-particle 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 quasi-repulsive regime, whereby the system is assumed to evolve non-adiabatically 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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