Magnification of spin Hall effect in bilayer electron gas

Abstract

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.

Revtex 10 pages, 4 figures; largely extended version

References in corpus (6)

• Dissipationless Quantum Spin Current at Room Temperature
• Spin current and polarization in impure 2D electron systems with spin-orbit coupling
• Current induced electron spin polarization in strained semiconductors
• SU(2) Non-Abelian Holonomy and Dissipationless Spin Current in Semiconductors
• Spin-Hall effect in a disordered 2D electron-system
• Spin Hall effect and Berry phase in two dimensional electron gas