电子束的自旋-轨道Angular Momentum转换和自旋极化滤波
Spin-to-Orbital Angular Momentum Conversion and Spin-Polarization Filtering in Electron Beams
摘要：
我们提出了一个空变Wien过滤器的电子束，诱导自旋半转，并利用自旋操作中产生的几何相位转换成相应的自旋角动量的变化到轨道的光束本身的角动量的设计。当应用于空间相干输入自旋极化电子束时，这种装置可以产生携带轨道角动量的电子涡旋束。当应用于非偏振输入光束时，所提出的器件与合适的衍射元件相结合，可以充当非常有效的自旋偏振滤波器。同样的方法也可以应用于中子或原子束。
英文摘要：
We propose the design of a space-variant Wien filter for electron beams that induces a spin half-turn and converts the corresponding spin angular momentum variation into orbital angular momentum of the beam itself by exploiting a geometrical phase arising in the spin manipulation. When applied to a spatially coherent input spin-polarized electron beam, such a device can generate an electron vortex beam, carrying orbital angular momentum. When applied to an unpolarized input beam, the proposed device, in combination with a suitable diffraction element, can act as a very effective spin-polarization filter. The same approach can also be applied to neutron or atom beams.
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