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A photoinduced current of a layered MoS2-based transistor is studied fromfirst-principles. Under the illumination of circular polarized light, avalley-polarized current is generated, which can be tuned by the gate voltage.For monolayer MoS2, the valley-polarized spin-up (down) electron current at K(K') points is induced by the right (left) circular polarized light. The valleypolarization is found to reach +1.0 (-1.0) for the valley current that carriedsuch a K (K') index. For bilayer MoS2, the spin-up (down) current can beinduced at both K and K' valleys by the right (left) circular light. Incontrast to monolayer MoS2, the photoinduced valley polarization showsasymmetric behavior upon reversal of the gate voltage. Our results show thatthe valley polarization of the photoinduced current can be modulated by thecircular polarized light and the gate voltage. All the results can be wellunderstood using a simple kp model.

Photoinduced valley-polarized current of layered MoS2 by electric tuning