Fermionic superfluidity with positive scattering length

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Superfluidity in an ultracold Fermi gas is usually associated with either a negative scattering length or the presence of a two-body bound state. We show that none of these ingredients is necessary to achieve superfluidity. Using a narrow Feshbach resonance with strong repulsive background interactions, the effective interactions can be repulsive for small energies and attractive for energies around the Fermi energy, similar to the effective interactions between electrons in a metallic superconductor. This can result in BCS-type superfluidity while the scattering length is positive.
Original languageEnglish
Article number023606
Pages (from-to)023606-1/6
Number of pages6
JournalPhysical Review A : Atomic, Molecular and Optical Physics
Issue number2
Publication statusPublished - 2006


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