Spin and valley filter based on two-dimensional WSe${}_2$ heterostructures

Abstract

In this work, we investigate spin and valley transport properties of a WSe${}_2$ monolayer placed on top of a ferromagnetic insulator. We are interested in controlling the transport properties by applying external potentials to the system. To obtain spin an valley polarizations, we have considered a single and a double barrier structure with gate potentials. We have analyzed how the efficiency of these polarized transport properties depend on the gate-potential intensities and geometrical configurations. Additionally, we investigate how the spin and valley transport properties are modified when an ac-potential is applied to the system. We have obtained a controllable modulation of the spin and valley polarizations as a function of the intensity and frequency of the ac-potential, mainly in the terahertz range. These results validate the proposal of double quantum well structures of WSe${}_2$ as candidates to provide spin and valley dependent transport within an optimal geometrical parameter regime.

12 pages and 11 figures

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