Abstract
We study, in a fully nonperturbative calculation, a dilute system of spin interacting fermions, characterized by an infinite scattering length at finite temperatures. Various thermodynamic properties and the condensate fraction are calculated and we also determine the critical temperature for the superfluid-normal phase transition in this regime. The thermodynamic behavior appears as a rather surprising and unexpected mélange of fermionic and bosonic features. The thermal response of a spin fermion at the BCS-BEC crossover should be classified as that of a new type of superfluid.
- Received 16 May 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.090404
©2006 American Physical Society