Photoinduced quantum spin and valley Hall effects, and orbital magnetization in monolayer MoS2

Abstract
We theoretically demonstrate that 100% valley-polarized transport in monolayers of MoS2 and other group-VI dichalcogenides can be obtained using off-resonant circularly polarized light. By tuning the intensity of the off-resonant light the intrinsic band gap in one valley is reduced, while it is enhanced in the other valley, enabling single valley quantum transport. As a consequence, we predict (i) enhancement of the longitudinal electrical conductivity, accompanied by an increase in the spin polarization of the flowing electrons, (ii) enhancement of the intrinsic spin Hall effect, together with a reduction of the intrinsic valley Hall effect, and (iii) enhancement of the orbital magnetic moment and orbital magnetization. These mechanisms provide appealing opportunities to the design of nanoelectronics based on dichalcogenides.

Citation
Photoinduced quantum spin and valley Hall effects, and orbital magnetization in monolayer MoS2, 2014, 90 (12) Physical Review B

Publisher
American Physical Society (APS)

Journal
Physical Review B

DOI
10.1103/PhysRevB.90.125438

arXiv
1504.04771

Additional Links
http://link.aps.org/doi/10.1103/PhysRevB.90.125438http://arxiv.org/abs/1504.04771

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