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

Abstract

We report on measurements of an elementary surface mode in an ultracold, strongly interacting Fermi gas of {sup 6}Li 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.

Authors:
; ; ;  [1]; ;  [1]
  1. Institute of Experimental Physics and Center for Quantum Physics, University of Innsbruck, 6020 Innsbruck (Austria)
Publication Date:
OSTI Identifier:
21020560
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 76; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.76.033610; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMS; BCS THEORY; BOSE-EINSTEIN CONDENSATION; COUPLING; DAMPING; EQUATIONS OF STATE; EXPANSION; FERMI GAS; FERMIONS; LITHIUM 6; OSCILLATIONS; PROBES; QUADRUPOLES; RESONANCE; SURFACES; TEMPERATURE RANGE 0000-0013 K

Citation Formats

Altmeyer, A, Wright, M J, Kohstall, C, Denschlag, J Hecker, Riedl, S, Grimm, R, and Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020 Innsbruck. Dynamics of a strongly interacting Fermi gas: The radial quadrupole mode. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.76.033610.
Altmeyer, A, Wright, M J, Kohstall, C, Denschlag, J Hecker, Riedl, S, Grimm, R, & Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020 Innsbruck. Dynamics of a strongly interacting Fermi gas: The radial quadrupole mode. United States. https://doi.org/10.1103/PHYSREVA.76.033610
Altmeyer, A, Wright, M J, Kohstall, C, Denschlag, J Hecker, Riedl, S, Grimm, R, and Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020 Innsbruck. Sat . "Dynamics of a strongly interacting Fermi gas: The radial quadrupole mode". United States. https://doi.org/10.1103/PHYSREVA.76.033610.
@article{osti_21020560,
title = {Dynamics of a strongly interacting Fermi gas: The radial quadrupole mode},
author = {Altmeyer, A and Wright, M J and Kohstall, C and Denschlag, J Hecker and Riedl, S and Grimm, R and Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020 Innsbruck},
abstractNote = {We report on measurements of an elementary surface mode in an ultracold, strongly interacting Fermi gas of {sup 6}Li 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.},
doi = {10.1103/PHYSREVA.76.033610},
url = {https://www.osti.gov/biblio/21020560}, journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 76,
place = {United States},
year = {2007},
month = {9}
}