Deformation of a Trapped Fermi Gas with Unequal Spin Populations

Details Deformation of a Trapped Fermi Gas with Unequal Spin Populations Deformation of a Trapped Fermi Gas with Unequal Spin Populations

2006-08-21

arxiv.org/abs/cond-mat/0608455v3

Phys.Rev.Lett.97:190407,2006

Physics

Condensed Matter

Other Condensed Matter

Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.97.190407

The real-space densities of a polarized strongly-interacting two-component Fermi gas of $^6$Li atoms reveal two low temperature regimes, both with a fully-paired core. At the lowest temperatures, the unpolarized core deforms with increasing polarization. Sharp boundaries between the core and the excess unpaired atoms are consistent with a phase separation driven by a first-order phase transition. In contrast, at higher temperatures the core does not deform but remains unpolarized up to a critical polarization. The boundaries are not sharp in this case, indicating a partially-polarized shell between the core and the unpaired atoms. The temperature dependence is consistent with a tricritical point in the phase diagram.

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