论文标题
通过量子隧穿共振增强电子和核自旋的耦合
Enhanced coupling of electron and nuclear spins by quantum tunneling resonances
论文作者
论文摘要
由于它们与环境的隔离，贵族旋转的时间很长，因此很长的连贯性时间，并在各种应用中找到了实际用途。但是，这种隔离会导致制备时间极慢，依赖于从电子旋转合奏中的弱自旋转移。在这里，我们提出了一种可控机制来提高此转移速率。我们用热，光学兴奋的钾原子分析了氦3原子的自旋动力学，并揭示了谐振二进制碰撞中准结合状态的形成。我们发现自旋交换横截面的谐振增强量最多六个数量级和两个数量级增强，以增强热平均的极化速率。我们进一步研究了其他各种贵重气体的影响，并发现增强是普遍的。我们概述了可以在实验观察并实际利用实验的可行条件。
Noble-gas spins feature hours long coherence times owing to their great isolation from the environment, and find practical usage in various applications. However, this isolation leads to extremely slow preparation times, relying on weak spin transfer from an electron-spin ensemble. Here we propose a controllable mechanism to enhance this transfer rate. We analyze the spin dynamics of helium-3 atoms with hot, optically-excited potassium atoms and reveal the formation of quasi-bound states in resonant binary collisions. We find a resonant enhancement of the spin-exchange cross section by up to six orders of magnitude and two orders of magnitude enhancement for the thermally averaged, polarization rate-coefficient. We further examine the effect for various other noble gases and find that the enhancement is universal. We outline feasible conditions under which the enhancement may be experimentally observed and practically utilized.
