Coherent spin mixing dynamics in thermal $^{87}$Rb spin-1 and spin-2 gases
Coherent spin mixing dynamics in thermal $^{87}$Rb spin-1 and spin-2 gases
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DOI：
10.1103/physreva.91.033635
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发表时间：
2015-03
影响因子：
2.9
通讯作者：
Xiaodong He;Bing Zhu;Xiaoke Li;Fudong Wang;Zhi-Fang Xu;Dajun Wang
中科院分区：
文献类型：
--
作者：
Xiaodong He;Bing Zhu;Xiaoke Li;Fudong Wang;Zhi-Fang Xu;Dajun Wang
研究了超冷Rb原子铁磁自旋1和反铁磁自旋2热气中的非平衡相干自旋混合动力学。在这两种情况下，都观察到了与磁场相关的长时间自旋布居振荡。Wigner分布函数的Boltzmann方程很好地再现了我们的观测结果。与旋量玻色-爱因斯坦凝聚体的运动方程相比，这里唯一的区别是与自旋相关的相互作用增加了两倍，这在自旋为2的情况下通过测量振荡幅度与样品密度的关系直接得到了证实。
We study the non-equilibrium coherent spin mixing dynamics in ferromagnetic spin-1 and antiferromagnetic spin-2 thermal gases of ultracold $^{87}$Rb atoms. Long lasting spin population oscillations with magnetic field dependent resonances are observed in both cases. Our observations are well reproduced by Boltzmann equations of the Wigner distribution function. Compared to the equation of motion of spinor Bose-Einstein condensates, the only difference here is a factor of two increase in the spin-dependent interaction, which is confirmed directly in the spin-2 case by measuring the relation between the oscillation amplitude and the sample's density.