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arXiv · 1305.5633

Spin Hall effect in spin-valley coupled monolayer transition-metal dichalcogenides

Wen-Yu Shan·Hai-Zhou Lu·Di Xiao
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Abstract

We study both the intrinsic and extrinsic spin Hall effect in spin-valley coupled monolayers of transition metal dichalcogenides. We find that whereas the skew-scattering contribution is suppressed by the large band gap, the side-jump contribution is comparable to the intrinsic one with opposite sign in the presence of scalar and magnetic scattering. Intervalley scattering tends to suppress the side-jump contribution due to the loss of coherence. By tuning the ratio of intra- to intervalley scattering, the spin Hall conductivity shows a sign change in hole-doped samples. Multiband effect in other doping regime is considered, and it is found that the sign change exists in the heavily hole-doped regime, but not in the electron-doped regime.

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Wen-Yu Shan, Hai-Zhou Lu, Di Xiao. 2013-09-19. Spin Hall effect in spin-valley coupled monolayer transition-metal dichalcogenides. https://doi.org/10.1103/physrevb.88.125301

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