Pairing effects in the nondegenerate limit of the two-dimensional Fermi gas

被引：37

作者：

Barth, Marcus ^{[1
]}

Hofmann, Johannes ^{[2
]}

机构：

[1] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

[2] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW A | 2014年 / 89卷 / 01期

关键词：

PSEUDOGAP; BEHAVIOR;

D O I：

10.1103/PhysRevA.89.013614

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The spectral function of a spin-balanced two-dimensional Fermi gas with short-range interactions is calculated by means of a quantum cluster expansion. Good qualitative agreement is found with a recent experiment by Feld et al. [Nature (London) 480, 75 (2011)]. The effects of pairing are clearly visible in the density of states, which displays a suppression of spectral weight due to the formation of a two-body bound state. In addition, the momentum distribution and the radio-frequency spectrum are derived, which are in excellent agreement with exact universal results. It is demonstrated that in the limit of high temperature, the quasiparticle excitations are well defined, allowing for a kinetic description of the gas.

引用

页数：10

共 41 条

[21]

Landau L., 2010, COURSE THEORETICAL P, V9

[22]

Landau L D, 2010, COURSE THEORETICAL P, V5

[23] Clock Shift in a Strongly Interacting Two-Dimensional Fermi Gas [J].

Langmack, Christian ;

Barth, Marcus ;

Zwerger, Wilhelm ;

Braaten, Eric .

PHYSICAL REVIEW LETTERS, 2012, 108 (06)

[24] Virial expansion with Feynman diagrams [J].

Leyronas, X. .

PHYSICAL REVIEW A, 2011, 84 (05)

[25] Exact few-body results for strongly correlated quantum gases in two dimensions [J].

Liu, Xia-Ji ;

Hu, Hui ;

Drummond, Peter D. .

PHYSICAL REVIEW B, 2010, 82 (05)

[26] Finite-Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations [J].

Magierski, Piotr ;

Wlazlowski, Gabriel ;

Bulgac, Aurel ;

Drut, Joaquin E. .

PHYSICAL REVIEW LETTERS, 2009, 103 (21)

[27] Pair Correlations in the Two-Dimensional Fermi Gas [J].

Ngampruetikorn, Vudtiwat ;

Levinsen, Jesper ;

Parish, Meera M. .

PHYSICAL REVIEW LETTERS, 2013, 111 (26)

[28]

Nishida Y, 2013, PHYS REV B, V88, DOI [10.1103/PhysRevB.88.224402, 10.1103/physRevB.88.224402]

[29] Probing strongly interacting atomic gases with energetic atoms [J].

Nishida, Yusuke .

PHYSICAL REVIEW A, 2012, 85 (05)

[30] Pairing instabilities in quasi-two-dimensional Fermi gases [J].

Pietilae, Ville ;

Pekker, David ;

Nishida, Yusuke ;

Demler, Eugene .

PHYSICAL REVIEW A, 2012, 85 (02)

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