Scale Invariance and Viscosity of a Two-Dimensional Fermi Gas

被引：123

作者：

Vogt, Enrico ^{[1
]}

Feld, Michael ^{[1
]}

Froehlich, Bernd ^{[1
]}

Pertot, Daniel ^{[1
]}

Koschorreck, Marco ^{[1
]}

Koehl, Michael ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

MODES; PSEUDOGAP;

D O I：

10.1103/PhysRevLett.108.070404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate collective excitations of a harmonically trapped two-dimensional Fermi gas from the collisionless (zero sound) to the hydrodynamic (first sound) regime. The breathing mode, which is sensitive to the equation of state, is observed with an undamped amplitude at a frequency 2 times the dipole mode frequency for a large range of interaction strengths and different temperatures. This provides evidence for a dynamical SO(2,1) scaling symmetry of the two-dimensional Fermi gas. Moreover, we investigate the quadrupole mode to measure the shear viscosity of the two-dimensional gas and study its temperature dependence.

引用

页数：4

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