Zero-range Fermi gas along the BCS-BEC crossover

Autor(es)

Pessoa, Renato ^[1] ; Vitiello, S. A. ^{[2, 3]} ; Schmidt, K. E. ^{[2, 4]}

Afiliação do(s) autor(es)

^[1] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go - Brazil

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

^[3] Univ Estadual Campinas, CENAPAD SP, BR-13083889 Campinas, SP - Brazil

^[4] Arizona State Univ, Dept Phys, Tempe, AZ 85287 - USA

• Tipo de documento: Artigo Científico
• Fonte: Physical Review A; v. 100, n. 5 NOV 4 2019.
• Citações Web of Science: 0

Resumo

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/ak(F) <= 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. (AU)

• Processo FAPESP: 16/17612-7 - Dinâmica de sistemas de muitos corpos IV
• Beneficiário: Arnaldo Gammal
• Modalidade de apoio: Auxílio à Pesquisa - Temático