Achieving a BCS transition in an atomic Fermi gas
arXiv:cond-mat/0308306 · doi:10.1103/PhysRevLett.92.150404
Abstract
We consider a gas of cold fermionic atoms having two spin components with interactions characterized by their s-wave scattering length . At positive scattering length the atoms form weakly bound bosonic molecules which can be evaporatively cooled to undergo Bose-Einstein condensation, whereas at negative scattering length BCS pairing can take place. It is shown that, by adiabatically tuning the scattering length from positive to negative values, one may transform the molecular Bose-Einstein condensate into a highly degenerate atomic Fermi gas, with the ratio of temperature to Fermi temperature . The corresponding critical final value of which leads to the BCS transition is found to be about one half, where is the Fermi momentum.
4 pages, 1 figure. Phys. Rev. Lett. in press
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