Abstract
We study the Fermi gas at unitarity and at 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 of minority atoms. We predict a first order phase transition from normal to superfluid at corresponding, in the presence of harmonic trapping, to a critical polarization . 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.
- Received 27 July 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.200403
©2006 American Physical Society