Pairing effects in the normal phase of a two-dimensional Fermi gas

被引：43

作者：

Marsiglio, F. ^{[1
,2
]}

Pieri, P. ^{[1
]}

Perali, A. ^{[3
]}

Palestini, F. ^{[1
]}

Strinati, G. C. ^{[1
,4
]}

机构：

[1] Univ Camerino, Sch Sci & Technol, I-62032 Camerino, MC, Italy

[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada

[3] Univ Camerino, Sch Pharm, I-62032 Camerino, MC, Italy

[4] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, PG, Italy

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

BOSE-EINSTEIN CONDENSATION; BCS SUPERCONDUCTIVITY; PSEUDOGAP STATE; EVOLUTION;

D O I：

10.1103/PhysRevB.91.054509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In a recent experiment [M. Feld et al., Nature (London) 480, 75 (2011); B. Frohlich et al., Phys. Rev. Lett. 109, 130403 (2012)], a pairing gap was detected in a two-dimensional (2D) Fermi gas with attractive interaction at temperatures where superfluidity does not occur. The question remains open as to whether this gap is a pseudogap phenomenon or is due to a molecular state. In this paper, by using a t-matrix approach, we reproduce quite well the experimental data for a 2D Fermi gas, and set the boundary between the pseudogap and molecular regimes. We also show that pseudogap phenomena occurring in 2D and 3D can be related through a variable spanning the BCS-BEC crossover in a universal way.

引用

页数：10

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