Spin-dependent transmission in waveguides with periodically modulated strength of the spin-orbit interaction

Wang, X. F.; Vasilopoulos, P.
August 2003
Applied Physics Letters;8/4/2003, Vol. 83 Issue 5, p940
Academic Journal
The electron transmission T is evaluated through waveguides, in which the strength of the spin-orbit interaction &alpha is varied periodically, using the transfer-matrix technique. It is shown that T exhibits a spin-transistor action, as a function of &alpha or of the length of one of the two subunits of the unit cell, provided only one mode is allowed to propagate in the waveguide. A similar but not periodic behavior occurs as a function of the incident electron energy. A transparent formula for T through one unit is obtained and helps explain its periodic behavior. The structure considered is a good candidate for the establishment of a realistic spin transistor.


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