Exotic superfluidity in cold atoms

Abstract

We derived the low energy effective action for the collective modes in asymmetric fermionic systems with attractive interaction. We obtained the phase diagram in terms of the chemical potentials. It features a stable gapless superfluidity with one Fermi surface on the BEC side of the resonance. Also we predict a sharp increase in outer core of a vortex, i.e. vortex size, upon entering into the gapless phase. This may serve as a signature of a gapless phase.

12 pages, 6 figures, proceedings of the conference "Shifmania, Crossing the Boundaries: Gauge Dynamics at Strong Coupling", May 14-17, 2009

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• Renormalization group fixed points, universal phase diagram, and 1/N expansion for quantum liquids with interactions near the unitarity limit
• Local Density Functional Theory for Superfluid Fermionic Systems: The Unitary Gas
• Phase diagram of a cold polarized Fermi gas
• Large-N expansion for unitary superfluid Fermi gases
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Polarization Measurements and the Pairing Gap in the Universal Regime