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.
Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas
PALESTINI, FABRIZIO;PERALI, Andrea;PIERI, Pierbiagio;STRINATI CALVANESE, Giancarlo
2010-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
