Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-12-24
Eur.Phys.J.B68:391-400,2009
Physics
Condensed Matter
Statistical Mechanics
Latex + 3 eps figures, accepted for publication in a special issue of EPJB on "Novel Quantum Phases and Mesoscopic Physics in
Scientific paper
10.1140/epjb/e2009-00016-8
We show that the effective theory of long wavelength low energy behavior of a dipolar Bose-Einstein condensate(BEC) with large dipole moments (treated as a classical spin) can be modeled using an extended Non-linear sigma model (NLSM) like energy functional with an additional non-local term that represents long ranged anisotropic dipole-dipole interaction. Minimizing this effective energy functional we calculate the density and spin-profile of the dipolar Bose-Einstein condensate in the mean-field regime for various trapping geometries. The resulting configurations show strong intertwining between the spin and mass density of the condensate, transfer between spin and orbital angular momentum in the form of Einstein-de Hass effect, and novel topological properties. We have also described the theoretical framework in which the collective excitations around these mean field solutions can be studied and discuss some examples qualitatively.
Ghosh Sankalpa
Machida Kazushige
Mizushima Takeshi
Takahashi Minoru
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