Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-02-03
J. Phys.: Condens. Matter, 21 (2009) 125801 (6pp)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 6 figures, accepted for publication in Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/21/12/125801
We show that an initially unpolarized electron flow acquires spin polarization after passing through a lateral barrier in two-dimensional (2D) system with spin-orbit interaction (SOI) even if the current is directed normally to the barrier. The generated spin current depends on the distance from the barrier. It oscillates with the distance in the vicinity of the barrier and asymptotically reaches a constant value. The most efficient generation of the spin current (with polarization above 50%) occurs, when the Fermi energy is near the potential barrier maximum. Since the spin current in SOI medium is not unambiguously defined we propose to pass this current from the SOI region into a contacting region without SOI and show, that the spin polarization loss under such transmission can be negligible.
Sablikov Vladimir A.
Sukhanov Aleksei A.
Tkach Yurii Ya.
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