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.
Density and spin response of a strongly-interacting Fermi gas in the attractive and quasi-repulsive regime / Palestini F.; PIERI, Pierbiagio; STRINATI CALVANESE, Giancarlo. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 108:8(2012), pp. 080401.080401-1-080401.080401-4. [10.1103/PhysRevLett.108.080401]
Density and spin response of a strongly-interacting Fermi gas in the attractive and quasi-repulsive regime
PIERI, Pierbiagio;
2012
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.