Fermionic superfluidity with positive scattering length

Details Fermionic superfluidity with positive scattering length Fermionic superfluidity with positive scattering length

2005-12-19

arxiv.org/abs/cond-mat/0512472v2

Phys. Rev. A 74, 023606 (2006).

Physics

Condensed Matter

Statistical Mechanics

6 pages, 3 figures; v2: added references and details energy-dependent interaction

Scientific paper

10.1103/PhysRevA.74.023606

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.

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