Abstract

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.

Keywords

PhysicsDiffusion Monte CarloQuantum Monte CarloMonte Carlo methodScattering lengthFermi gasSpinsCondensed matter physicsScatteringCorrelation function (quantum field theory)Fermi Gamma-ray Space TelescopeEquation of stateWave functionQuantum mechanicsMonte Carlo molecular modelingElectron

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Year
2004
Type
article
Volume
93
Issue
20
Pages
200404-200404
Citations
510
Access
Closed

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G. E. Astrakharchik, J. Boronat, J. Casulleras et al. (2004). Equation of State of a Fermi Gas in the BEC-BCS Crossover: A Quantum Monte Carlo Study. Physical Review Letters , 93 (20) , 200404-200404. https://doi.org/10.1103/physrevlett.93.200404

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DOI
10.1103/physrevlett.93.200404