Normal state of a polarized fermi gas at unitarity

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...

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Bibliographic Details
Published in:Physical review letters 2006-11, Vol.97 (20), p.200403-200403, Article 200403
Main Authors: Lobo, C, Recati, A, Giorgini, S, Stringari, S
Format: Article
Language:English
Subjects:
BINDING ENERGY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIPOLES
EFFECTIVE MASS
EQUATIONS OF STATE
FERMI GAS
INTERACTIONS
MONTE CARLO METHOD
PHASE TRANSFORMATIONS
POLARIZATION
QUASI PARTICLES
SPIN
SUPERFLUIDITY
TRAPPING
UNITARITY
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Summary: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 downward arrow/n upward 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 upward arrow - N downward arrow/(N upward arrow + N downward 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.97.200403