1999/11/02 by Jürgen Reidl, J. Reidl, András Csordás +4 · 3 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #cond-mat
paper · pdf · doi:10.1103/physreva.61.043606
10 pages revtex, 3 figures in postscript
arxiv created 1999/11/02 · openalex publication_date 2000/03/10 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present predictions for temperature-dependent shifts and damping rates. They are obtained by applying the dielectric formalism to set up a self-consistent model of a trapped Bose gas which can be shown to satisfy generalized Ward identities. Within the framework of the model we use lowest-order perturbation theory to determine the first-order correction to the results of Hartree-Fock-Bogoliubov-Popov theory for the complex collective excitation frequencies, and present numerical results for the temperature dependence of the damping rates and the frequency shifts. Good agreement with the experimental values measured by Jin et al. [Phys. Rev. Lett. 77, 420 (1996)] are found for the m=2 mode, while we find disagreements in the shifts for m=0. The latter point to the necessity of a nonperturbative treatment for an explanation of the temperature dependence of the m=0 shifts.