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arXiv 1810.00570quant-ph
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强相互作用碱金属自旋的同步

Synchronization of strongly interacting alkali-metal spins

Or Katz, Ofer Firstenberg

发表信息：
Phys. Rev. A 98, 012712 (2018)
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摘要：

气态碱金属原子的自旋通常被假定为以恒定的超精细频率振荡，多年来一直被用来定义第二。事实上，在标准实验条件下，自旋独立振荡，只有微弱的扰动和缓慢衰减，由于随机自旋-自旋碰撞。在这里，我们考虑一个不同的，未经探索的制度非常密集的气体，碰撞，更频繁的超精细频率，占主导地位的动态。与直觉相反，我们发现超精细振荡变得明显更长的寿命，并且它们的频率变得依赖于系综的状态，表现出强烈的非线性动力学。我们发现，非线性起源于一个多体相互作用的电子自旋，驱动它们进入一个单一的集体模式。该政权的实验实现的条件进行了概述。

英文摘要：

The spins of gaseous alkali atoms are commonly assumed to oscillate at a constant hyperfine frequency, which for many years has been used to define the Second. Indeed, under standard experimental conditions, the spins oscillate independently, only weakly perturbed and slowly decaying due to random spin-spin collisions. Here we consider a different, unexplored regime of very dense gas, where collisions, more frequent than the hyperfine frequency, dominate the dynamics. Counter-intuitively, we find that the hyperfine oscillations become significantly longer-lived, and their frequency becomes dependent on the state of the ensemble, manifesting strong nonlinear dynamics. We reveal that the nonlinearity originates from a many-body interaction which synchronizes the electronic spins, driving them into a single collective mode. The conditions for experimental realizations of this regime are outlined.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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