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Quantum Monte Carlo study of the ground-state properties of a Fermi gas in the BCS-BEC crossover (Articolo in rivista)

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Quantum Monte Carlo study of the ground-state properties of a Fermi gas in the BCS-BEC crossover (Articolo in rivista) (literal)

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Giorgini, S; Astrakharchik, GE; Boronat, J; Casulleras, J (2006)
Quantum Monte Carlo study of the ground-state properties of a Fermi gas in the BCS-BEC crossover
in International journal of modern physics b
(literal)

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Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; INFM, BEC, I-38050 Trento, Italy; Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia; Univ Politecn Catalunya, Dept Fis & Engn Nucl, E-08034 Barcelona, Spain (literal)

Titolo

Quantum Monte Carlo study of the ground-state properties of a Fermi gas in the BCS-BEC crossover (literal)

Abstract

The ground-state properties of a two-component Fermi gas with attractive short-range interactions are calculated 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. We calculate the energy per particle, the one- and two-body density matrix as a function of the interaction strength. Results for the momentum distribution of the atoms, as obtained from the Fourier transform of the one-body density matrix, are reported as a function of the interaction strength. Off-diagonal long-range order in the system is investigated through the asymptotic behavior of the two-body density matrix. The condensate fraction of pairs is calculated in the unitary limit and on both sides of the BCS-BEC crossover. (literal)

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