2006/07/27 by C. Lobo, A. Recati, S. Giorgini +1 · 1 citation
Physics and Astronomy · #cond-mat.other
paper · pdf · doi:10.1103/physrevlett.97.200403
arxiv created 2006/07/27 · arxiv updated 2009/12/01
We study the Fermi gas at unitarity and at T=0 by assuming that, at high polarizations, it is a normal Fermi liquid composed of weakly interacting quasiparticles associated with the minority spin atoms. With a quantum Monte Carlo approach we calculate their effective mass and binding energy, as well as the full equation of state of the normal phase as a function of the concentration x=n_\down/n_\up of minority atoms. We predict a first order phase transition from normal to superfluid at xc=0.44 corresponding, in the presence of harmonic trapping, to a critical polarization Pc=(N_\up-N_\down)/ (N_\up+N_\down)=77%. We calculate the radii and the density profiles in the trap and predict that the frequency of the spin dipole mode will be increased by a factor of 1.23 due to interactions.