Normal State of a Polarized Fermi Gas at Unitarity

C. Lobo, A. Recati, S. Giorgini, and S. Stringari
Phys. Rev. Lett. 97, 200403 – Published 13 November 2006

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/n 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=(NN)/(N+N)=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.

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  • Received 27 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.200403

©2006 American Physical Society

Authors & Affiliations

C. Lobo, A. Recati, S. Giorgini, and S. Stringari

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

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Issue

Vol. 97, Iss. 20 — 17 November 2006

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