Ph.D. (Doctor of Philosophy)
Department of Physics
Spintronics aims at using not only the electron's electric charge but also its quantum mechanical spin in order to develop novel device concepts beyond conventional charge-based electronics. Currently tremendous efforts are underway world-wide to achieve this goal and the theoretical research proposed here is part of it. In particular, the conditions are analyzed under which a device of nanometer size can deliver a beam of spin-oriented electrons using the spin-dependent reflection at a barrier. This work starts out from the fact that electrons can have two spin orientations, up and down. When the electrons in a tiny layer of a semiconductor like InSb hit a barrier, spin-up and spin-down electrons are reflected into different directions so that an appropriate set-up can select one or the other reflected beam. We study the conditions under which this set-up can be used to create a spin-polarized electron beam from a beam of initially unpolarized electrons. Inside the interference zone between the incoming and spin-flipped reflected beams parallel to the barrier, we get stripes of well-defined electron spin orientations.
Teodorescu, Voltaire, "Spin polarization of electrons by reflection at a barrier" (2008). Graduate Research Theses & Dissertations. 5020.
viii, 107 pages
Northern Illinois University
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