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arXiv 1306.2235physics.opticsquant-ph
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利用多极磁场产生自旋极化电子束

Generation of a spin-polarized electron beam by multipoles magnetic fields

Ebrahim Karimi, Vincenzo Grillo, Robert W. Boyd, Enrico Santamato

摘要:

研究了具有整数拓扑荷的横向磁场中电子束的传输。自旋-磁相互作用引入了电子的非均匀自旋进动,其在与场的拓扑电荷成比例的横向平面中获得空间变化的几何相位,其手性取决于输入电子的自旋状态。我们所提出的设备与电子轨道角动量分选器的组合可以被用作在中等能量范围内的电子束的自旋过滤器。我们研究这两种不同的配置的部分自旋过滤器发电机数值。这些分析结果可用于改进型电子显微镜的设计。

英文摘要:

The propagation of an electron beam in the presence of transverse magnetic fields possessing integer topological charges is presented. The spin--magnetic interaction introduces a nonuniform spin precession of the electrons that gains a space-variant geometrical phase in the transverse plane proportional to the field's topological charge, whose handedness depends on the input electron's spin state. A combination of our proposed device with an electron orbital angular momentum sorter can be utilized as a spin-filter of electron beams in a mid-energy range. We examine these two different configurations of a partial spin-filter generator numerically. The results of these analysis could prove useful in the design of improved electron microscope.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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