BCS-BEC crossover in a gas of Fermi atoms with a Feshbach resonance

被引：432

作者：

Ohashi, Y

Griffin, A

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 305, Japan

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.89.130402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss the BCS-BEC crossover in a degenerate Fermi gas of two hyperfine states interacting close to a Feshbach resonance. We show that, by including fluctuation contributions to the free energy similar to that considered by Nozieres and Schmitt-Rink, the character of the superfluid phase transition continuously changes from the BCS-type to the BEC-type, as the threshold of the quasimolecular band is lowered. In the BEC regime, the superfluid phase transition is interpreted in terms of molecules associated with both the Feshbach resonance and Cooper pairing.

引用

页数：4

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