Kibble-Zurek mechanism in a trapped ferromagnetic Bose-Einstein condensate
Kibble-Zurek mechanism in a trapped ferromagnetic Bose-Einstein condensate
复制标题
俘获铁磁玻色-爱因斯坦凝聚体中的基布尔-祖雷克机制
DOI：
10.1088/0953-8984/25/40/404212
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
and Masahito Ueda
中科院分区：
文献类型：
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作者：
Hiroki Saito;Yuki Kawaguchi;and Masahito Ueda
基于平均场理论，研究了自旋为1的玻色-爱因斯坦凝聚体在磁相变过程中自发自旋涡旋的形成。在简谐囚禁势中，原子密度的不均匀导致了临界点、磁化时间和自旋关联长度的空间变化。即使在这种非均匀旋量凝聚中，当二次塞曼能量猝灭足够快时，Kibble-Zurek现象也会出现。对于慢猝灭，磁化区从陷阱中心逐渐扩展，推出自旋涡旋，这阻碍了Kibble-Zurek机制的发生。文中还讨论了环形囚禁势的情况。
Spontaneous spin vortex formation in a magnetic phase transition of a trapped spin-1 Bose–Einstein condensate is investigated based on mean-field theory. In a harmonic trapping potential, an inhomogeneous atomic density leads to spatial variations of the critical point, magnetization time, and spin correlation length. The Kibble–Zurek phenomena are shown to emerge even in such inhomogeneous spinor condensates, when the quench of the quadratic Zeeman energy is fast enough. For slow quench, the magnetized region gradually expands from the center of the trap, pushing out spin vortices, which hinders the Kibble–Zurek mechanism from occurring. The case of a toroidal trapping potential is also discussed.