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arXiv · 1207.5404

Spin transmission control in helical magnetic fields

Henri Saarikoski·Tobias Dollinger·Klaus Richter
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Abstract

We calculate spin transport in two-dimensional waveguides in the presence of spatially modulated Zeeman-split energy bands. We show that in a regime where the spin evolution is predominantly adiabatic the spin backscattering rate can be tuned via diabatic Landau-Zener transitions between the spin-split bands [C. Betthausen et. al., Science 337, 324 (2012)]. This mechanism is tolerant against spin-independent scattering processes. Completely spin-polarized systems show full spin backscattering, and thus current switching. In partially spin-polarized systems a spatial sequence of Landau-Zener transition points enhances the resistance modulation via reoccupation of backscattered spin-polarized transport modes. We discuss a possible application as a spin transistor.

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Henri Saarikoski, Tobias Dollinger, Klaus Richter. 2012-07-23. Spin transmission control in helical magnetic fields. https://doi.org/10.1103/physrevb.86.165407

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