Magnetic Properties and Strong-Coupling Corrections in an Ultracold Fermi Gas with Population Imbalance

被引：4

作者：

Kashimura, T. ^{[1
]}

Watanabe, R. ^{[1
]}

Ohashi, Y. ^{[1
]}

机构：

[1] Keio Univ, Dept Phys, Yokohama, Kanagawa 2238522, Japan

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2013年 / 171卷 / 3-4期

关键词：

Superfluidity; Population imbalance; Strong-coupling effects; PHASE-SEPARATION; SUPERCONDUCTORS; STATE; FLUCTUATIONS; CROSSOVER; FIELD;

D O I：

10.1007/s10909-012-0724-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate magnetic properties of an ultracold Fermi gas with population imbalance. In the presence of population imbalance, the strong-coupling theory developed by NoziSres and Schmitt-Rink (which is frequently referred to as the NSR theory, or Gaussian fluctuation theory) is known to give unphysical results in the BCS-BEC crossover region. We point out that this problem comes from how to treat pseudogap effects originating from pairing fluctuations and many-body corrections to the spin susceptibility. We also clarify how to overcome this problem by including higher order fluctuations beyond the ordinary T-matrix approximation. Calculated spin susceptibility based on our extended T-matrix approximation agrees well with the recent experiment on a Li-6 Fermi gas.

引用

页码：355 / 361

页数：7

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