Tunable electrical control of magnetism in chiral stacked graphene-transition metal dichalcogenide heterostructures

Electrical control of magnetism has been a longstanding goal of the spintronics community. In this talk, I will explain how such control can be potentially realized in a two-dimensional heterostructure of chiral stacked multilayer graphene sandwiched in between transition metal dichalcogenides (TMDs). We show that, the proximity induced spin-orbit coupling (SOC) in chiral multilayer graphene will favor two isospin (spin/valley) flavors over the other two, and then the Coulomb interaction will spontaneously pick one of the two via the Stoner mechanism. By choosing a proper alignment between the graphene multilayer and TMDs, the sign of the proximity induced SOC in graphene, and therefore the favored isospin flavor, can be reversed by flipping the direction of the perpendicular electric field. Combining these ingredients, we show how to use the perpendicular electric field to flip either spin or valley depending on their g factors. We also show how to control the valley g factor by the number of graphene layers and the magnitude of the perpendicular electric field, which allows one to flip spin or valley on demand.