Breakdown of the local density approximation in interacting systems of cold fermions in strongly anisotropic traps

Details Breakdown of the local density approximation in interacting systems of cold fermions in strongly anisotropic traps Breakdown of the local density approximation in interacting systems of cold fermions in strongly anisotropic traps

2006-04-18

arxiv.org/abs/cond-mat/0604423v2

Phys. Rev. A 74, 053626 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Final published version

Scientific paper

10.1103/PhysRevA.74.053626

We consider spin-polarized mixtures of cold fermionic atoms on the BEC side of the Feshbach resonance. We demonstrate that a strongly anisotropic confining potential can give rise to a double-peak structure in the axial distribution of the density difference and a polarization-dependent aspect ratio of the minority species. Both phenomena appear as a result of the breakdown of the local density approximation for the phase-separated regime. We speculate on the implications of our findings for the unitary regime.

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