Spin polarizability of a trapped superfluid Fermi gas

Details Spin polarizability of a trapped superfluid Fermi gas Spin polarizability of a trapped superfluid Fermi gas

2006-05-31

arxiv.org/abs/cond-mat/0605754v1

Phys. Rev. Lett 97, 190403 (2006)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.97.190403

The polarization produced by the relative displacement of the potentials trapping two spin species of a dilute Fermi gas with $N_\ua=N_\da$ is calculated at unitarity by assuming phase separation between the superfluid and a spin polarized phase at zero temperature. Due to the energy cost associated with pair breaking, the dipole magnetic polarizability vanishes in the linear limit and exhibits important deviations from the ideal gas behaviour even for displacements of the order of the size of the atomic cloud. The magnetic behaviour in the presence of different trapping frequencies for the two spin species is also discussed.

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