Equation of State of a Fermi Gas in the BEC-BCS Crossover: A Quantum Monte Carlo Study
G. E. AstrakharchikDipartimento di Fisica, Università di Trento and BEC-INFM, I-38050 Povo, Italy and Institute of Spectroscopy, 142190 Troitsk, Moscow region, RussiaJ. BoronatDepartament de Física i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politècnica de Catalunya, E-08034 Barcelona, SpainJ. CasullerasDepartament de Física i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politècnica de Catalunya, E-08034 Barcelona, Spainand S. GiorginiDipartimento di Fisica, Università di Trento and BEC-INFM, I-38050 Povo, Italy
2004en
ABI
Аннотация
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 a(m)=0.6a. The pair correlation functions of parallel and opposite spins are also discussed as a function of the interaction strength.
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