Spin Hall effect due to intersubband-induced spin-orbit interaction in symmetric quantum wells

Abstract

We investigate the intrinsic spin Hall effect in two-dimensional electron gases in quantum wells with two subbands, where a new intersubband-induced spin-orbit coupling is operative. The bulk spin Hall conductivity ${\sigma }_{xy}^z$ is calculated in the ballistic limit within the standard Kubo formalism in the presence of a magnetic field $B$ and is found to remain finite in the B=0 limit, as long as only the lowest subband is occupied. Our calculated ${\sigma }_{xy}^z$ exhibits a nonmonotonic behavior and can change its sign as the Fermi energy (the carrier areal density $n_{2D}$) is varied between the subband edges. We determine the magnitude of ${\sigma }_{xy}^z$ for realistic InSb quantum wells by performing a self-consistent calculation of the intersubband-induced spin-orbit coupling.

7 pages, 3 figures

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Cited by in corpus (5)

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• Three-Dimensional Interface Roughness in Layered Semiconductor Structures and Its Effects on Intersubband Transitions
• Effects of scattering area shape on spin conductance in a four-terminal spin-Hall setup