Universal Fermi gas with two- and three-body resonances

被引：44

作者：

Nishida, Yusuke ^{[1
]}

Son, Dam Thanh ^{[1
]}

Tan, Shina ^{[1
]}

机构：

[1] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 09期

关键词：

22;

D O I：

10.1103/PhysRevLett.100.090405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider a Fermi gas with two components of different masses, with the s-wave two-body interaction tuned to unitarity. In the range of mass ratio 8.62 < M/m < 13.6, it is possible for a short-range interaction between heavy fermions to produce a resonance in a three-body channel. The resulting system is scale invariant and has universal properties, and is very strongly interacting. When M/m is slightly above the lower limit 8.62, the ground state energy of a 2:1 mixture of heavy and light fermions is less than 2% of the energy of a noninteracting gas with the same number densities. We derive exact relationships between the pressures of the unitary Fermi gases with and without three-body resonance when the mass ratio is close to the critical values of 8.62 and 13.6.

引用

页数：4