Magnification of spin Hall effect in bilayer electron gas

Details Magnification of spin Hall effect in bilayer electron gas Magnification of spin Hall effect in bilayer electron gas

2007-02-20

arxiv.org/abs/cond-mat/0702456v2

Phys. Rev. B 76, 235311 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex 10 pages, 4 figures; largely extended version

Scientific paper

10.1103/PhysRevB.76.235311

Spin transport properties of a coupled bilayer electron gas with Rashba spin-orbit coupling are studied. The definition of the spin currents in each layer as well as the corresponding continuity-like equations in the bilayer system are given. The curves of the spin Hall conductivities obtained in each layer exhibit sharp cusps around a particular value of the tunnelling strength and the conductivities undergo sign changes across this point. Our investigation on the impurity effect manifests that an arbitrarily small concentration of nonmagnetic impurities does not suppress the spin Hall conductivity to zero in the bilayer system. Based on these features, an experimental scheme is suggested to detect a magnification of the spin Hall effect.

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