Zero-range Fermi gas along the BCS-BEC crossover

Renato Pessoa, S. A. Vitiello, K. E. Schmidt

Research output: Contribution to journalArticle

Abstract

Properties of the ground state of an unpolarized ultracold Fermi gas along the BCS-BEC crossover are investigated by the variational and diffusion Monte Carlo methods. We apply the Wigner-Bethe-Peierls boundary condition in our calculations to avoid any bias from using an interatomic potential with finite effective range. Properties for several values of the scattering length are studied in the range-8≤1/akF≤4, including the unitary limit. The contact parameters as a function of scattering length are obtained by fitting the pair distribution functions for particles with different spins. The energies and contact parameters are in very good agreement with experimental data reported in the literature.

Original languageEnglish (US)
Article number053601
JournalPhysical Review A
Volume100
Issue number5
DOIs
StatePublished - Nov 4 2019

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crossovers
scattering
gases
Monte Carlo method
distribution functions
boundary conditions
ground state
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Zero-range Fermi gas along the BCS-BEC crossover. / Pessoa, Renato; Vitiello, S. A.; Schmidt, K. E.

In: Physical Review A, Vol. 100, No. 5, 053601, 04.11.2019.

Research output: Contribution to journalArticle

Pessoa, Renato ; Vitiello, S. A. ; Schmidt, K. E. / Zero-range Fermi gas along the BCS-BEC crossover. In: Physical Review A. 2019 ; Vol. 100, No. 5.
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