Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: Spin-controlled Transport II
HL 26.5: Talk
Tuesday, March 23, 2010, 15:15–15:30, H14
An exact solution to the problem of spin edge state — Vahram Grigoryan1, Alex Matos-Abiague2, and •Samvel Badalyan1,2 — 1Department of Radiophysics, Yerevan State University, 1 A. Manoukian Street, 375025 Yerevan, Armenia — 2Department of Physics, University of Regensburg, 93040 Regensburg, Germany
We present an exact solution to the problem of spin edge state, which generalizes the bulk solution by Rashba to the important for spin transport case of the current carrying spin channels. The obtained spin edge states are induced by the combined effect of spin-orbit interaction and hard-wall confining potential in a two dimensional system, exposed to a perpendicular magnetic field. We are able to explain exactly how the spin resolved edge states are separated in space, to achieve a deeper intuitive understanding of the exact behavior of spin and spin current components, depending on the electron position with respect to the sample edges and as a function of the Fermi energy of the electron gas. These findings can serve as an effective tool for controlling the spin motion in spintronic devices. The presented exact solution can be a strong input in studying the spin transport through edge channels in semiconductor nanostructures.
Work is supported by the Volkswagen Foundation, EU Grant PIIF-GA-2009-235394, ANSEF Grant PS-1576, and SFB Grant 689.