Tuesday, June 11, 2013

1306.2235 (Ebrahim Karimi et al.)

Generation of a spin-polarized electron beam by multipoles magnetic

Ebrahim Karimi, Vincenzo Grillo, Robert W. Boyd, Enrico Santamato
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.
View original: http://arxiv.org/abs/1306.2235

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