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- Helmholtz-Zentrum Berlin für Materialien und EnergieDE144 papers
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7 papers · 2 filters
Bose-Einstein Condensation Temperature of Dipolar Gas in Anisotropic Harmonic Trap
Konstantin Glaum, Axel Pelster
We consider a dilute gas of dipole moments in an arbitrary harmonic trap and treat both the short-range, isotropic delta-interaction and the long-range, anisotropic dipole-dipole i…
Gapless Hartree-Fock-Bogoliubov Approximation for Bose Gases
V. I. Yukalov, H. Kleinert
A dilute Bose system with Bose-Einstein condensate is considered. It is shown that the Hartree-Fock-Bogolubov approximation can be made both conserving as well as gapless. This is…
Nonequivalent operator representations for Bose-condensed systems
V. I. Yukalov
The necessity of accurately taking into account the existence of nonequivalent operator representations, associated with canonical transformations, is discussed. It is demonstrated…
Self-similar power transforms in extrapolation problems
S. Gluzman, V. I. Yukalov
A method is suggested allowing for the improvement of accuracy of self-similar factor and root approximants, constructed from asymptotic series. The method is based on performing a…
Critical Temperature of Weakly Interacting Dipolar Condensates
Konstantin Glaum, Axel Pelster, Hagen Kleinert +1
We calculate perturbatively the effect of a dipolar interaction upon the Bose-Einstein condensation temperature. This dipolar shift depends on the angle between the symmetry axes o…
The magnetic reorientation transition in thin ferromagnetic films treated by many-body Green's function theory
P. Fröbrich, P. J. Kuntz
This contribution describes the reorientation of the magnetization of thin ferromagnetic Heisenberg films as function of the temperature and/or an external field. Working in a rota…