Low Temperature Physics: 45, 923 (2019); https://doi.org/10.1063/1.5116544
Fizika Nizkikh Temperatur: Volume 45, Number 8 (August 2019), p. 1078-1083 ( to contents , go back )
Ballistic quantum spin separator
E. Zhitlukhina1,2, M. Belogolovskii2,3, and P. Seidel4
1O.O. Galkin Donetsk Institute for Physics and Engineering, National Academy of Sciences of Ukraine, 46 Nauki Ave., Kyiv 03028, Ukraine
2Vasyl’ Stus Donetsk National University, 600-richya Str. 21, Vinnytsia 21021, Ukraine
3G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 36 Academician Vernadsky Blvd., Kyiv 03142, Ukraine
4Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, 5 Helmholtzweg, Jena 07743, Germany
Received March 4, 2019, published online June 26, 2019
Spin-dependent ballistic transport in a mesoscopic three-terminal Y-shaped setup with a spin-discriminating ferromagnetic membrane in one of the outgoing leads is studied using the Landauer–Büttiker formalism. Our calculations, performed at sufficiently low temperatures when thermal effects and magnon scattering become vanishingly small, predict a strong quantum-interference caused enhancement of a spin-filtering effect originally arising due to the band-structure mismatch between the ferromagnetic metal and the lead. Finally, we discuss its possible applications for an efficient injection of a spin-polarized current into a superconductor and for self-controlled spin currents in quantum spintronic networks.
Key words: spintronics, quantum charge transport, spin filtering, nanoscale beam splitter, spin separation.