Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-03-22
J. Phys.: Condens. Matter 16 (2004) 9143-9154
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages with 7 figures
Scientific paper
10.1088/0953-8984/16/50/005
We demonstrate how the Rashba spin-orbit coupling in semiconductor heterostructures can produce and control a spin-polarized current without ferromagnetic leads. Key idea is to use spin-double refraction of an electronic beam with a nonzero incidence angle. A region where the spin-orbit coupling is present separates the source and the drain without spin-orbit coupling. We show how the transmission and the beam spin-polarization critically depend on the incidence angle. The transmission halves when the incidence angle is greater than a limit angle and a significant spin-polarization appears. Increasing the spin-orbit coupling one can obtain the modulation of the intensity and of the spin-polarization of the output electronic current when the input current is unpolarized. Our analysis shows the possibility to realize a spin-field-effect transistor based on the propagation of only one mode with the region with spin-orbit coupling. Where the original Datta and Das device [Appl.Phys.Lett. {\bf 56}, 665 (1990)] use the spin-precession that originates from the interference between two modes with orthogonal spin.
Bercioux Dario
Cataudella Vittorio
Filippis Giulio de
Perroni C. A.
Ramaglia Vincenzo Marigliano
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