Phys. Rev. Lett. 93, 200404 (2004) [4 pages]Equation of State of a Fermi Gas in the BEC-BCS Crossover: A Quantum Monte Carlo StudyReceived 4 June 2004; published 10 November 2004 We calculate the equation of state of a two-component Fermi gas with attractive short-range interspecies interactions using the fixed-node diffusion Monte Carlo method. The interaction strength is varied over a wide range by tuning the value a of the s-wave scattering length of the two-body potential. For a>0 and a smaller than the inverse Fermi wave vector our results show a molecular regime with repulsive interactions well described by the dimer-dimer scattering length am=0.6a. The pair correlation functions of parallel and opposite spins are also discussed as a function of the interaction strength. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.200404
DOI:
10.1103/PhysRevLett.93.200404
PACS:
03.75.Hh, 05.30.Fk, 21.65.+f
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