Collective modes of three- and two-dimensional trapped Fermi gases in the normal phase

22nd International Laser Physics Workshop

Urban, M.^1 ; Chiacchiera, S.^2 ; Davesne, D.^3 ; Enss, T.^4 ; Pantel, P.-A.^3

Institut de Physique Nucléaire, CNRS/IN2P3, University Paris Sud, 91406 Orsay cedex, France^1

Centro de Física Computacional, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal^2

IPN Lyon, Université de Lyon, CNRS/IN2P3, 69622 Villeurbanne cedex, France^3

Institut für Theoretische Physik, Universität Heidelberg, D-69120 Heidelberg, Germany^4

关键词: Collective modes;    Collisionless regime;    Frequency shift;    Higher order moments;    Second order moment;    Sloshing modes;    Trap potentials;    Trapped fermi gas;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/497/1/012028/pdf
DOI  :  10.1088/1742-6596/497/1/012028

来源: IOP

【 摘 要 】

We study the transition from the hydrodynamic to the collisionless regime in collective modes of three- and two-dimensional Fermi gases by using the semiclassical Boltzmann equation. We use direct numerical simulations as well as the method of phase-space moments to solve the Boltzmann equation and show that the restriction to second-order moments is not accurate enough. By including higher-order moments, we can successfully describe the hydrodynamic to collisionless transition observed in the quadrupole mode in three-dimensional Fermi gases and the frequency shift and damping of the sloshing mode due to the anharmonic shape of the experimental trap potential. In the case of two-dimensional Fermi gases, however, the strong damping of the quadrupole mode observed in a recent experiment remains unexplained.