Electrical manipulation of valley polarization in van der Waals Heterostructure

Transition metal dichalcogenides (TMDCs) possessing valley degrees of freedom have attracted significant attention in recent years. Currently, the control and manipulation of these valley degrees of freedom predominantly rely on optical excitation. Electrical manipulation of the valley degree of freedom is also crucial for advancing the field of valleytronics. Here, we experimentally demonstrate the capability to electrically control valley polarization by constructing a van der Waals heterostructure consisting of TMDCs materials and ferromagnetic materials. The valley polarization can be achieved through spin filtering, driven by the inherent spin-valley locking in TMDCs monolayers. Our results introduce a novel approach to manipulate valley degrees of freedom in TMDCs materials, offering promising prospects for practical applications in valleytronics.