Spontaneous demagnetization of a dipolar spinor Bose gas in an ultralow magnetic field.
Spontaneous demagnetization of a dipolar spinor Bose gas in an ultralow magnetic field.
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DOI：
10.1103/physrevlett.106.255303
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发表时间：
2011-03
影响因子：
8.6
通讯作者：
B. Pasquiou;Etienne Mar'echal;G. Bismut;P. Pedri;L. Vernac;O. Gorceix;B. Laburthe-Tolra
中科院分区：
文献类型：
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作者：
B. Pasquiou;Etienne Mar'echal;G. Bismut;P. Pedri;L. Vernac;O. Gorceix;B. Laburthe-Tolra
我们研究了S = 3（52）Cr凝聚体的旋量性质，其中偶极-偶极相互作用允许磁化强度的变化。我们观察到一个退磁的玻色-爱因斯坦凝聚体（BEC）时，磁场淬火低于一个临界值对应于一个铁磁和非极化基态之间的相变，这发生在自旋相关的接触相互作用压倒线性塞曼效应。通过在深二维光晶格中加载BEC，当密度增加时，临界场增加。磁化动力学由偶极-偶极相互作用设定。
We study the spinor properties of S = 3 (52)Cr condensates, in which dipole-dipole interactions allow changes in magnetization. We observe a demagnetization of the Bose-Einstein condensate (BEC) when the magnetic field is quenched below a critical value corresponding to a phase transition between a ferromagnetic and a nonpolarized ground state, which occurs when spin-dependent contact interactions overwhelm the linear Zeeman effect. The critical field is increased when the density is raised by loading the BEC in a deep 2D optical lattice. The magnetization dynamics is set by dipole-dipole interactions.