Equation of state of a Fermi gas in the BEC-BCS crossover: A quantum Monte Carlo study

被引：445
作者：
Astrakharchik, GE [1 ]
Boronat, J
Casulleras, J
Giorgini, S
机构：
[1] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy
[2] INFM, BEC, I-38050 Trento, Italy
[3] Inst Spect, Troitsk 142190, Moscow Region, Russia
[4] Univ Politecn Catalunya, Dept Fis & Engn Nucl, E-08034 Barcelona, Spain
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 20期
关键词：
D O I：
10.1103/PhysRevLett.93.200404
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页码：200404 / 1
页数：4
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