arXiv 1105.02802011-05-02cond-mat.quant-gasquant-ph

磁场梯度诱导旋量凝聚体的磁化振荡

Magnetization Oscillation of a Spinor Condensate Induced by Magnetic Field Gradient

Jie Zhang, Baoguo Yang, Yunbo Zhang

备注：: 6 pages, 5 figures, Phys. Rev. A accepted
发表信息：: Phys. Rev. A 83, 053634 (2011)
DOI：: 10.1103/PhysRevA.83.053634

摘要：

研究了自旋为1的超冷原子在具有场梯度$m=ρ_{+}-ρ_{-}$的弱非均匀磁场中的自旋混合动力学.在平均场论中，对铁磁和极性相互作用两种情况下的$m_F=0$塞曼分量$ρ_{0}$以及系统磁化强度$m$的动力学进行了说明.我们发现系统磁化的动力学可以在类似于双阱的约瑟夫森振荡和有趣的自陷机制之间进行调节，即自旋混合动力学维持自发磁化。同时，在极性相互作用的情况下，$ρ_0$的动力学可以充分抑制初始不平衡的数量分布。在初始分布平衡的情况下，极性相互作用会出现磁化强度的拍频振荡，而铁磁相互作用则消失。

英文摘要：

We study the spin mixing dynamics of ultracold spin-1 atoms in a weak non-uniform magnetic field with field gradient $G$, which can flip the spin from +1 to -1 so that the magnetization $m=ρ_{+}-ρ_{-}$ is not any more a constant. The dynamics of $m_F=0$ Zeeman component $ρ_{0}$, as well as the system magnetization $m$, are illustrated for both ferromagnetic and polar interaction cases in the mean-field theory. We find that the dynamics of system magnetization can be tuned between the Josephson-like oscillation similar to the case of double well, and the interesting self-trapping regimes, i.e. the spin mixing dynamics sustains a spontaneous magnetization. Meanwhile the dynamics of $ρ_0$ may be sufficiently suppressed for initially imbalanced number distribution in the case of polar interaction. A "beat-frequency" oscillation of the magnetization emerges in the case of balanced initial distribution for polar interaction, which vanishes for ferromagnetic interaction.

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英文摘要：

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