Pietro Massignan, Zhenhua Yu, Georg M. Bruun
We analyze when a repulsively-interacting two-component Fermi gas is thermodynamically stable in a phase separated state. We focus on the strongly polarised limit where the many-body problem can be described accurately in terms of repulsive polarons and the entropy of mixing. Phase diagrams as a function of polarisation, temperature, mass imbalance, and polaron energy as well as scattering length and range parameter are provided. When extrapolated to zero polarisation, our results are consistent with Monte-Carlo calculations. The lifetime of the polaron state is shown to increase significantly with the interaction range, which raises the prospects of realizing the elusive itinerant ferromagnetic phase with ultracold atoms at a moderately narrow Feshbach resonance.
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http://arxiv.org/abs/1301.3163
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