The Non-universal behaviour of Cold Fermi Condensates with Narrow Feshbach Resonances

Details The Non-universal behaviour of Cold Fermi Condensates with Narrow Feshbach Resonances The Non-universal behaviour of Cold Fermi Condensates with Narrow Feshbach Resonances

2008-10-10

arxiv.org/abs/0810.1796v2

Phys. Rev. A 80, 043621, 2009

Physics

Condensed Matter

Superconductivity

7 pages, there is no differences in results between this (v2) and the older version (v1), but v2 makes the nature of the non-c

Scientific paper

10.1103/PhysRevA.80.043621

In this paper we construct an effective field theory for a condensate of cold Fermi atoms whose scattering is controlled by a narrow Feshbach resonance. We show how, from first principles, it permits a hydrodynamic description of the BEC-BCS crossover from which the equation of state, intimately related to the speed of sound, can be derived. Specifically, we stress the non-universal behaviour of the equation of state at the unitary limit of infinite scattering length that arises when either, or both, of the range of the inter-atomic force and the scale of the molecular field become large.

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