Collective excitations of a degenerate Fermi vapour in a magnetic trap

被引：54

作者：

Amoruso, M

Meccoli, I

Minguzzi, A

Tosi, MP

机构：

[1] Scuola Normale Super Pisa, Ist Nazl Fis Mat & Classe Sci, I-56126 Pisa, Italy

[2] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

来源：

EUROPEAN PHYSICAL JOURNAL D | 1999年 / 7卷 / 03期

关键词：

D O I：

10.1007/s100530050588

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We evaluate the small-amplitude excitations of a spin-polarized vapour of Fermi atoms confined inside a harmonic trap. The dispersion law omega = omega f[l + 4n(n + l + 2)/3](1/2) is Obtained for the vapour in the collisional regime inside a spherical trap of frequency omega(f), with n the number of radial nodes and l 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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页码：441 / 447

页数：7

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