无碰撞囚禁原子气体中的累积同自旋转动效应
Cumulative identical spin rotation effects in collisionless trapped atomic gases
摘要：
本文讨论了Du等人最近在一个稀薄的囚禁费米气体中观测到的具有“反常”大时间尺度和振幅的强自旋分凝现象。在无碰撞区，原子在阱中快速振荡，并以能量依赖的方式平均不均匀的外场，这控制了它们的横向自旋进动频率。在不同自旋方向的原子之间的相互作用中，相同的自旋旋转效应（ISRE）将原子转移到上自旋或下自旋状态，这取决于它们的运动能量。由于低能原子比高能原子更接近陷阱的中心，最终的结果是自旋和位置之间的强相关性。
英文摘要：
We discuss the strong spin segregation in a dilute trapped Fermi gas recently observed by Du et al. with "anomalous" large time scale and amplitude. In a collisionless regime, the atoms oscillate rapidly in the trap and average the inhomogeneous external field in an energy dependent way, which controls their transverse spin precession frequency. During interactions between atoms with different spin directions, the identical spin rotation effect (ISRE) transfers atoms to the up or down spin state, depending on their motional energy. Since low energy atoms are closer to the center of the trap than high energy atoms, the final outcome is a strong correlation between spins and positions.
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