Abstract
AbstractControl of valley degree of freedom in monolayer transition‐metal dichalcogenide (TMDC) has been realized by using optical pumping and magnetic fields. However, an electrical approach is missing and has potential for practical applications. In this paper, valley/ferroelectricity coupling is demonstrated for the first time in a monolayer WTe2/YMnO3 heterostructure. Tunable valley splitting by an electric field is predicted when a valley‐polarized monolayer TMDC is deposited on a multiferroic substrate. The fundamental principle behind this is an intermediate lattice–ferroelectricity coupling. An electric field changes the surface morphology of the substrate, hence the distance, that is, the exchange interaction, between the substrate and monolayer. The resulting tunable valley splitting brings a new component to electrically controlled valleytronics.
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