Abstract:
We evaluate the small-amplitude excitations of a spin-polarized vapour of Fermi atoms confined inside a harmonic trap. The dispersion law is obtained for the vapour in the collisional regime inside a spherical trap of frequency , with n the number of radial nodes and the orbital angular momentum. The low-energy excitations are also treated in the case of an axially symmetric harmonic confinement. The collisionless regime is discussed with main reference to a Landau-Boltzmann equation for the Wigner distribution function: this equation is solved within a variational approach allowing an account of non-linearities. A comparative discussion of the eigenmodes of oscillation for confined Fermi and Bose vapours is presented in an Appendix.
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Received 23 February 1999 and Received in final form 21 April 1999
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Amoruso, M., Meccoli, I., Minguzzi, A. et al. Collective excitations of a degenerate Fermi vapour in a magnetic trap. Eur. Phys. J. D 7, 441–447 (1999). https://doi.org/10.1007/s100530050588
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DOI: https://doi.org/10.1007/s100530050588