Collisionless collective modes of fermions in magnetic traps

Details Collisionless collective modes of fermions in magnetic traps Collisionless collective modes of fermions in magnetic traps

2000-12-20

arxiv.org/abs/cond-mat/0012378v1

Phys. Rev. A 63, 063606 (2001).

Physics

Condensed Matter

10 pages, 9 figures

Scientific paper

10.1103/PhysRevA.63.063606

We present a Random-Phase-Approximation formalism for the collective spectrum of two hyperfine species of dilute 40K atoms, magnetically trapped at zero temperature and subjected to a repulsive s-wave interaction between atoms with different spin projections. We examine the density-like and the spin-like oscillation spectra, as well as the transition density profiles created by external multipolar fields. The zero sound spectrum is always fragmented and the density and spin channels become clearly distinguishable if the trapping potentials acting on the species are identical. Although this distinction is lost when these confining fields are different, at selected excitation frequencies the transition densities may display the signature of the channel.

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