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Energies and damping rates of elementary excitations in spin-1 Bose-Einstein-condensed gases

Energies and damping rates of elementary excitations in spin-1 Bose-Einstein-condensed gases The finite temperature Green’s function technique is used to calculate the energies and damping rates of the elementary excitations of homogeneous, dilute, spin-1 Bose gases below the Bose-Einstein condensation temperature in both the density and spin channels. For this purpose a self-consistent dynamical Hartree-Fock model is formulated, which takes into account the direct and exchange processes on equal footing by summing up certain classes of Feynman diagrams. The model is shown to satisfy the Goldstone theorem and to exhibit the hybridization of one-particle and collective excitations correctly. The results are applied to gases of 23 Na and 87 Rb atoms. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Energies and damping rates of elementary excitations in spin-1 Bose-Einstein-condensed gases

Physical Review A , Volume 68 (2) – Aug 1, 2003
19 pages

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References (8)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2003 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.68.023612
Publisher site
See Article on Publisher Site

Abstract

The finite temperature Green’s function technique is used to calculate the energies and damping rates of the elementary excitations of homogeneous, dilute, spin-1 Bose gases below the Bose-Einstein condensation temperature in both the density and spin channels. For this purpose a self-consistent dynamical Hartree-Fock model is formulated, which takes into account the direct and exchange processes on equal footing by summing up certain classes of Feynman diagrams. The model is shown to satisfy the Goldstone theorem and to exhibit the hybridization of one-particle and collective excitations correctly. The results are applied to gases of 23 Na and 87 Rb atoms.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Aug 1, 2003

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