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arXiv · 1203.6348

Induced superfluidity of imbalanced Fermi gases near unitarity

Kelly R. Patton·Daniel E. Sheehy
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Abstract

The induced intraspecies interactions among the majority species, mediated by the minority species, is computed for a population-imbalanced two-component Fermi gas. Although the Feshbach-resonance mediated interspecies interaction is dominant for equal populations, leading to singlet s-wave pairing, we find that in the strongly imbalanced regime the induced intraspecies interaction leads to p-wave pairing and superfluidity of the majority species. Thus, we predict that the observed spin-polaron Fermi liquid state in this regime is unstable to p-wave superfluidity, in accordance with the results of Kohn and Luttinger, below a temperature that, near unitarity, we find to be within current experimental capabilities. Possible experimental signatures of the p-wave state using radio-frequency spectroscopy as well as density-density correlations after free expansion are presented.

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Kelly R. Patton, Daniel E. Sheehy. 2012-03-28. Induced superfluidity of imbalanced Fermi gases near unitarity. https://doi.org/10.1103/physreva.85.063625

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