Trap anharmonicity and sloshing mode of a Fermi gas
arXiv:1206.5688 · doi:10.1103/PhysRevA.86.023635
Abstract
For a gas trapped in a harmonic potential, the sloshing (or Kohn) mode is undamped and its frequency coincides with the trap frequency, independently of the statistics, interaction and temperature of the gas. However, experimental trap potentials have usually Gaussian shape and anharmonicity effects appear as the temperature and, in the case of Fermions, the filling of the trap are increased. We study the sloshing mode of a degenerate Fermi gas in an anharmonic trap within the Boltzmann equation, including in-medium effects in both the transport and collision terms. The calculated frequency shifts and damping rates of the sloshing mode due to the trap anharmonicity are in satisfactory agreement with the available experimental data. We also discuss higher-order dipole, octupole, and bending modes and show that the damping of the sloshing mode is caused by its coupling to these modes.
10 pages; v2: comparison with damping data added, minor extensions and corrections
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Cited by in corpus (5)
- Relativistic Boltzmann transport approach with Bose-Einstein statistics and the onset of gluon condensation
- Collective excitations of quasi-two-dimensional trapped dipolar fermions: transition from collisionless to hydrodynamic regime
- Numerical solution of the Boltzmann equation for trapped Fermi gases with in-medium effects
- Effects of interaction on field-induced resonances in confined Fermi liquid
- Decay of the Kohn mode in hydrodynamic regime