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 MoS${}_2$ 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.

10 pages and 2 figs

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Cited by in corpus (10)

• Floquet topological phase transition in $\alpha$-${\mathcal{T}}_3$ lattice
• Photoinduced spin-Hall resonance in a k^3-Rashba spin-orbit coupled two dimensional hole system
• Valley-controlled transport in graphene/ WSe${}_2$ heterostructures under an off-resonant polarized light
• Low-temperature thermal transport and thermopower of monolayer transition metal dichalcogenide semiconductors
• Photoinduced metallic Volkov-Pankratov states in semi-Dirac material
• Topological hybrid semimetal phases and anomalous Hall effects in a three dimensional magnetic topological insulator
• Photoinduced dc Hall current in few-layer black phosphorus with a gate-tunable Floquet gap
• Optically tunable spin Hall effect in periodically driven monolayer transition metal dichalcogenides
• Topological Properties of Bilayer $\alpha -T_3$ Lattice Induced by Polarized Light
• Volkov-Pankratov states in a driven semimetal for a generic interface