热$^{87}$ Rb自旋1和自旋2气体中的相干自旋混合动力学
Coherent spin mixing dynamics in thermal $^{87}$Rb spin-1 and spin-2 gases
摘要：
研究了超冷$^{87}$ Rb原子在铁磁自旋1和反铁磁自旋2热气体中的非平衡相干自旋混合动力学。在这两种情况下，观察到持久的自旋粒子数振荡与磁场相关的共振。我们的观察很好地再现了玻尔兹曼方程的维格纳分布函数。与旋量玻色-爱因斯坦凝聚体的运动方程相比，这里唯一的区别是自旋相关相互作用增加了两倍，这在自旋2的情况下通过测量振荡幅度与样品密度之间的关系直接证实。
英文摘要：
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.
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