Normal state of a polarized fermi gas at unitarity

Year: 2006

Authors: Lobo C., Recati A., Giorgini S., Stringari S.

Autors Affiliation: Dipartimento di Fisica, Università di Trento and CNR-INFM BEC Center, I-38050 Povo, Trento, Italy

Abstract: 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 arrow)/n(up arrow) of minority atoms. We predict a first order phase transition from normal to superfluid at x(c)=0.44 corresponding, in the presence of harmonic trapping, to a critical polarization P(c)=(N(up arrow)-N(down arrow))/(N(up arrow)+N(down arrow))=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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 97 (20)      Pages from: 200403-1  to: 200403-4

KeyWords: strongly interacting fermions; Landau-Fermi liquid theory; polaron physics
DOI: 10.1103/PhysRevLett.97.200403

Citations: 224
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