Broken-axisymmetry phase of a spin-1 ferromagnetic Bose-Einstein condensate

被引：79
作者：
Murata, Keiji [1 ]
Saito, Hiroki
Ueda, Masahito
机构：
[1] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan
[2] Univ Electro Commun, Dept Appl Phys & Chem, Tokyo 1828585, Japan
[3] Japan Sci & Technol Corp, ERATO, Saitama 3320012, Japan
来源：
PHYSICAL REVIEW A | 2007年 / 75卷 / 01期
关键词：
D O I：
10.1103/PhysRevA.75.013607
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A spin-1 ferromagnetic Bose-Einstein condensate subject to a certain magnetic field exhibits a broken-axisymmetry phase in which the magnetization tilts against the applied magnetic field due to the competition between ferromagnetism and linear and quadratic Zeeman effects. The Bogoliubov analysis shows that in this phase two Goldstone modes associated with U(1) and SO(2) symmetry breakings exist, in which phonons and magnons are coupled to restore the two broken symmetries.
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