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  • Title: Spin-to-orbital angular momentum conversion and spin-polarization filtering in electron beams.
    Author: Karimi E, Marrucci L, Grillo V, Santamato E.
    Journal: Phys Rev Lett; 2012 Jan 27; 108(4):044801. PubMed ID: 22400850.
    Abstract:
    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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