Spin 1/2 Fermions in the Unitary Regime: A Superfluid of a New Type

Details Spin 1/2 Fermions in the Unitary Regime: A Superfluid of a New Type Spin 1/2 Fermions in the Unitary Regime: A Superfluid of a New Type

2005-05-16

arxiv.org/abs/cond-mat/0505374v3

Phys.Rev.Lett. 96 (2006) 090404

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure, published version

Scientific paper

10.1103/PhysRevLett.96.090404

We have studied, in a fully non-perturbative calculation, a dilute system of spin 1/2 interacting fermions, characterized by an infinite scattering length at finite temperatures. Various thermodynamic properties and the condensate fraction were calculated and we have also determined the critical temperature for the superfluid-normal phase transition in this regime. The thermodynamic behavior appears as a rather surprising and unexpected melange of fermionic and bosonic features. The thermal response of a spin 1/2 fermion at the BCS-BEC crossover should be classified as that of a new type of superfluid.

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