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Damping of the quadrupole mode in a two-dimensional Fermi gas: an unsolved puzzle

Abstract : In a recent experiment [E. Vogt et al., Phys. Rev. Lett. 108, 070404 (2012)], quadrupole and breathing modes of a two-dimensional Fermi gas were studied. We model these collective modes by solving the Boltzmann equation via the method of phase-space moments up to fourth order, including in-medium effects on the scattering cross section. In our analysis, we use a realistic Gaussian potential deformed by the presence of gravity and magnetic field gradients. We conclude that the origin of the experimentally observed damping of the quadrupole mode, especially in the weakly interacting (or even non-interacting) case, cannot be explained by these mechanisms.
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Contributor : Sophie Heurteau <>
Submitted on : Monday, September 30, 2013 - 10:19:20 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:30 PM

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S. Chiacchiera, D. Davesne, T. Enss, Michael Urban. Damping of the quadrupole mode in a two-dimensional Fermi gas: an unsolved puzzle. Physical Review A, American Physical Society, 2013, 88, pp.053616. ⟨10.1103/PhysRevA.88.053616⟩. ⟨in2p3-00867546⟩

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