Broken-axisymmetry phase of a spin-1 ferromagnetic Bose-Einstein condensate
Broken-axisymmetry phase of a spin-1 ferromagnetic Bose-Einstein condensate
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DOI：
10.1103/physreva.75.013607
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发表时间：
2006-07
影响因子：
2.9
通讯作者：
K. Murata;H. Saito;Masahito Ueda
中科院分区：
文献类型：
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作者：
K. Murata;H. Saito;Masahito Ueda
自旋为1的铁磁玻色-爱因斯坦凝聚体在一定磁场作用下，由于铁磁效应与线性塞曼效应和二次塞曼效应之间的竞争，其磁化强度与外加磁场相反，呈现出一种断裂轴对称相。Bogoliubov分析表明，在这一阶段存在两个与U(1)和SO(2)对称性破缺相关的Goldstone模式，声子和磁振子耦合以恢复两个破缺的对称性。
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.