Attractive Fermi gases with unequal spin populations in highly elongated traps

Details Attractive Fermi gases with unequal spin populations in highly elongated traps Attractive Fermi gases with unequal spin populations in highly elongated traps

2006-10-16

arxiv.org/abs/cond-mat/0610437v2

Physical Review Letters 98, 070402 (2007)

Physics

Condensed Matter

Other Condensed Matter

Final accepted version

Scientific paper

We investigate two-component attractive Fermi gases with imbalanced spin populations in trapped one dimensional configurations. The ground state properties are determined within local density approximation, starting from the exact Bethe-ansatz equations for the homogeneous case. We predict that the atoms are distributed according to a two-shell structure: a partially polarized phase in the center of the trap and either a fully paired or a fully polarized phase in the wings. The partially polarized core is expected to be a superfluid of the FFLO type. The size of the cloud as well as the critical spin polarization needed to suppress the fully paired shell, are calculated as a function of the coupling strength.

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