论文标题
循环自旋效应在强烈的背景字段中
Loop spin effects in intense background fields
论文作者
论文摘要
在平面波和聚焦的激光背景中分析了辐射和非辐射电子自旋翻转概率。我们提供了平面波中旋转动力学的简单且物理上透明的描述，并证明存在一种运动学状态，其中QED的通常领先顺序的扰动层次结构是逆转的，而非辐射循环效应主导着辐射树水平的自旋 - 旋转液体。我们表明，尽管由于对田间几何形状的敏感性高灵敏度，这种循环占主导地位被焦点激光脉冲抑制，但仍然存在一种制度，从原则上讲，可以识别循环对自旋跃迁的影响。
Radiative and non-radiative electron spin flip probabilities are analysed in both plane wave and focussed laser backgrounds. We provide a simple and physically transparent description of spin dynamics in plane waves, and demonstrate that there exists a kinematic regime in which the usual leading order perturbative hierarchy of QED is reversed, and non-radiative loop effects dominate over radiative tree-level spin-flips. We show that while this loop-dominance becomes suppressed in focussed laser pulses due to a high sensitivity to field geometry, there is nevertheless a regime in which, in principle, loop effects on spin transitions can be discerned.
