Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition

被引：53

作者：

Tey, Meng Khoon ^{[1
,2
]}

Sidorenkov, Leonid A. ^{[1
,2
]}

Guajardo, Edmundo R. Sanchez ^{[1
,2
]}

Grimm, Rudolf ^{[1
,2
]}

Ku, Mark J. H. ^{[3
,4
]}

Zwierlein, Martin W. ^{[3
,4
]}

Hou, Yan-Hua ^{[5
,6
]}

Pitaevskii, Lev ^{[5
,6
,7
]}

Stringari, Sandro ^{[5
,6
]}

机构：

[1] Austrian Acad Sci, IQOQI, A-6020 Innsbruck, Austria

[2] Univ Innsbruck, Inst Phys Expt, A-6020 Innsbruck, Austria

[3] MIT, Elect Res Lab, MIT Harvard Ctr Ultracold Atoms, Cambridge, MA 02139 USA

[4] MIT, Dept Phys, Cambridge, MA 02139 USA

[5] Univ Trent, Dipartimento Fis, I-38123 Povo, Italy

[6] INO CNR BEC Ctr, I-38123 Povo, Italy

[7] RAS, Kapitza Inst Phys Problems, Moscow 119334, Russia

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 05期

基金：

奥地利科学基金会; 欧洲研究理事会; 美国国家科学基金会;

关键词：

ULTRACOLD GASES; THERMODYNAMICS;

D O I：

10.1103/PhysRevLett.110.055303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We provide a joint theoretical and experimental investigation of the temperature dependence of the collective oscillations of first sound nature exhibited by a highly elongated harmonically trapped Fermi gas at unitarity, including the region below the critical temperature for superfluidity. Differently from the lowest axial breathing mode, the hydrodynamic frequencies of the higher-nodal excitations show a temperature dependence, which is calculated starting from Landau two-fluid theory and using the available experimental knowledge of the equation of state. The experimental results agree with high accuracy with the predictions of theory and provide the first evidence for the temperature dependence of the collective frequencies near the superfluid phase transition. DOI: 10.1103/PhysRevLett.110.055303

引用

页数：5

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