标题： 通过激光场偏振控制双色基普塔-狄拉克散射中的电子自旋动力学 显示英文标题

标题： Controlling electron spin dynamics in bichromatic Kapitza-Dirac scattering by the laser field polarization

摘要： 电子束在不同偏振几何结构的反向传播双色激光波中的自旋依赖卡皮察-狄拉克散射被研究。 相应的散射概率通过时间依赖狄拉克方程的解析和数值解获得，假设场频比为2。 当基本场模为圆偏振时，我们表明在低强度下自旋动力学通常被抑制，但在高强度下可以变得明显。 相反，当线性或椭圆偏振的基本模式与圆偏振的二次谐波结合时，在低场强度下就会出现强烈的自旋效应。 特别是，识别出一种偏振配置，它可作为自由电子的自旋滤波器。 显示英文摘要

摘要： Spin-dependent Kapitza-Dirac scattering of electron beams from counterpropagating bichromatic laser waves in various polarization geometries is studied. The corresponding scattering probabilities are obtained by analytical and numerical solutions of the time-dependent Dirac equation, assuming a field frequency ratio of 2. When the fundamental field mode is circular-polarized, we show that spin dynamics are generally suppressed at low intensities, but can become distinct at high intensities. Conversely, when a linearly or elliptically polarized fundamental mode is combined with a second harmonic of circular polarization, strong spin effects arise already at low field intensities. In particular, a polarization configuration is identified which acts as a spin filter for free electrons.