On microscopic theory of spin-S Bose-Einstein condensate in a magnetic field

Details On microscopic theory of spin-S Bose-Einstein condensate in a magnetic field On microscopic theory of spin-S Bose-Einstein condensate in a magnetic field

2007-06-25

arxiv.org/abs/0706.3617v1

Physica A 380, 202 (2007)

Physics

Condensed Matter

Statistical Mechanics

11 pages

Scientific paper

10.1016/j.physa.2007.02.107

The Bogoliubov model for weakly interacting Bose gas is extended to Bose-Einstein condensation (BEC) of spin-S atoms in a magnetic field. Equation for the vectorial order parameter valid at temperature $T\to 0$ is derived and its particular solution is found. This solution corresponds to the formation of BEC of atoms with a definite spin projection onto direction of a magnetic field. We study the thermodynamic stability of the found solution and obtain the expressions for low-lying collective modes.

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