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

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

2009-07-23

arxiv.org/abs/0907.4078v2

Phys. Rev. B 80, 155314 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures

Scientific paper

10.1103/PhysRevB.80.155314

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 $\sigma^z_{xy}$ 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 $\sigma^z_{xy}$ 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 $\sigma^z_{xy}$ for realistic InSb quantum wells by performing a self-consistent calculation of the intersubband-induced spin-orbit coupling.

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