Zero-range Fermi gas along the BCS-BEC crossover

被引：3

作者：

Pessoa, Renato ^{[1
]}

Vitiello, S. A. ^{[2
,3
]}

Schmidt, K. E. ^{[2
,4
]}

机构：

[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

来源：

PHYSICAL REVIEW A | 2019年 / 100卷 / 05期

关键词：

QUANTUM MONTE-CARLO; MANY-BODY PROBLEM; ATOMS;

D O I：

10.1103/PhysRevA.100.053601

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：5

共 35 条

[1] Equation of state of a Fermi gas in the BEC-BCS crossover: A quantum Monte Carlo study [J].

Astrakharchik, GE ;

Boronat, J ;

Casulleras, J ;

Giorgini, S .

PHYSICAL REVIEW LETTERS, 2004, 93 (20) :200404-1

[2] BCS-BEC Crossover in a Two-Dimensional Fermi Gas [J].

Bertaina, G. ;

Giorgini, S. .

PHYSICAL REVIEW LETTERS, 2011, 106 (11)

[3]

Bethe H., 1935, P ROY SOC, V148, P146, DOI 10.1098/rspa.1935.0010

[4] Exact relations for a strongly interacting fermi gas from the operator product expansion [J].

Braaten, Eric ;

Platter, Lucas .

PHYSICAL REVIEW LETTERS, 2008, 100 (20)

[5] High-fidelity pseudopotentials for the contact interaction [J].

Bugnion, P. O. ;

Rios, P. Lopez ;

Needs, R. J. ;

Conduit, G. J. .

PHYSICAL REVIEW A, 2014, 90 (03)

[6] Superfluid Fermi gases with large scattering length [J].

Carlson, J ;

Chang, SY ;

Pandharipande, VR ;

Schmidt, KE .

PHYSICAL REVIEW LETTERS, 2003, 91 (05) :504011-504014

[7] Auxiliary-field quantum Monte Carlo method for strongly paired fermions [J].

Carlson, J. ;

Gandolfi, Stefano ;

Schmidt, Kevin E. ;

Zhang, Shiwei .

PHYSICAL REVIEW A, 2011, 84 (06)

[8] Quantum Monte Carlo studies of superfluid Fermi gases [J].

Chang, SY ;

Pandharipande, VR ;

Carlson, J ;

Schmidt, KE .

PHYSICAL REVIEW A, 2004, 70 (04) :043602-1

[9] Effective-range dependence of resonantly interacting fermions [J].

Forbes, Michael McNeil ;

Gandolfi, Stefano ;

Gezerlis, Alexandros .

PHYSICAL REVIEW A, 2012, 86 (05)

[10] Resonantly Interacting Fermions in a Box [J].

Forbes, Michael McNeil ;

Gandolfi, Stefano ;

Gezerlis, Alexandros .

PHYSICAL REVIEW LETTERS, 2011, 106 (23)

← 1 2 3 4 →