The sensitivity of strong-field ionization to atomic orbital helicity has attracted much attention from physicists, due to its potential application in attosecond spectroscopy and spintronics. In order to intuitively observe the physical mechanisms of helicity-dependent ionization rates during photoionization, the concept of the Wigner phase can be used to characterize the different interactions between the rotating electrons and the Coulomb potential. Here, we find that in both one- and three-photon ionization schemes, the electrons liberated more easily by the circularly polarized laser field suffer less influence of the Coulomb potential during the propagation and then accumulate less Winger phase. This result indicates that the strength of the interaction between the rotating electrons and the Coulomb potential can explain the helicity-dependent ionization for different ionization mechanisms universally, which is also supported by our classical ensemble analysis. Our work provides an intuitive perspective towards the physics picture of ionization propensity rules.

中文翻译：

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圆偏振激光场中光电离的螺旋度相关维格纳相移

强场电离对原子轨道螺旋度的敏感性由于其在阿秒光谱学和自旋电子学中的潜在应用而引起了物理学家的广泛关注。为了直观地观察光电离过程中依赖于螺旋度的电离率的物理机制，可以使用维格纳相的概念来表征旋转电子与库仑势之间的不同相互作用。在这里，我们发现在单光子和三光子电离方案中，圆偏振激光场更容易释放的电子在传播过程中受库仑势的影响较小，因此积累的温格相较少。这一结果表明，旋转电子与库仑势之间相互作用的强度可以普遍解释不同电离机制的螺旋度相关电离，这也得到了我们经典系综分析的支持。我们的工作为电离倾向规则的物理图提供了一个直观的视角。