Spin-Orbit Larmor Clock for Ionisation Times in One-Photon and Strong-Field Regimes
Spin-Orbit Larmor Clock for Ionisation Times in One-Photon and Strong-Field Regimes
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用于单光子和强场状态下电离时间的自旋轨道拉莫尔时钟
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
O. Smirnova
中科院分区：
文献类型：
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作者：
J. Kaushal;F. Morales;L. Torlina;M. Ivanov;O. Smirnova
光电离是吸收一个或多个光子释放电子并在量子系统（例如原子或分子）中产生空穴的过程。使用一个或多个光子去除电子更快吗？如何定义这个时间？在这里，我们引入了一个时钟，它允许我们定义单光子和多光子电离机制的电离时间。时钟利用电子或空穴自旋与其轨道运动产生的磁场的相互作用，称为自旋轨道相互作用。磁场中自旋进动的角度记录了时间。我们结合分析理论和从头计算来展示电离延迟如何取决于吸收光子的数量、它在实验中如何出现以及它意味着什么电子动力学。特别是，我们应用我们的方法来计算强场电离隧道机制中导出的时间延迟。
Photoionisation is a process where absorption of one or several photons liberates an electron and creates a hole in a quantum system, such as an atom or a molecule. Is it faster to remove an electron using one or many photons, and how to define this time? Here we introduce a clock that allows us to define ionisation time for both one-photon and many-photon ionisation regimes. The clock uses the interaction of the electron or hole spin with the magnetic field created by their orbital motion, known as the spin-orbit interaction. The angle of spin precession in the magnetic field records time. We use the combination of analytical theory and ab-initio calculations to show how ionisation delay depends on the number of absorbed photons, how it appears in the experiment and what electron dynamics it signifies. In particular, we apply our method to calculate the derived time delays in tunnelling regime of strong-field ionisation.