Dynamics of a strongly interacting Fermi gas: The radial quadrupole mode

被引：47

作者：

Altmeyer, A. ^{[1
]}

Riedl, S.

Wright, M. J.

Kohstall, C.

Denschlag, J. Hecker

Grimm, R.

机构：

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

[2] Univ Innsbruck, Ctr Quantum Phys, A-6020 Innsbruck, Austria

[3] Austrian Acad Sci, Inst Quantum Opt & Quantum Informat, A-6020 Innsbruck, Austria

来源：

PHYSICAL REVIEW A | 2007年 / 76卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.76.033610

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on measurements of an elementary surface mode in an ultracold, strongly interacting Fermi gas of Li-6 atoms. The radial quadrupole mode allows us to probe hydrodynamic behavior in the crossover from Bose-Einstein condensation (BEC) to the Bardeen-Cooper-Schrieffer (BCS) regime without being influenced by changes in the equation of state. We examine the frequency and damping of this mode, along with its expansion dynamics. In the unitarity limit and on the BEC side of the resonance, the observed frequencies agree with standard hydrodynamic theory. However, on the BCS side of the crossover, a striking downshift of the oscillation frequency is observed in the hydrodynamic regime as a precursor to an abrupt transition to collisionless behavior; this indicates coupling of the oscillation to fermionic pairs.

引用

页数：10

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