Valley-polarized domain wall magnons in 2D ferromagnetic bilayers.

摘要: Valleytronics is a pioneering technological field relying on the valley degree of freedom to achieve novel electronic functionalities. Topological valley-polarized electrons confined domain walls in bilayer graphene were extensively studied view their potentials valleytronics. Here, we study magnonic version wall excitations 2D honeycomb ferromagnetic bilayers (FBL) with collinear order. In particular, explore implications Dzyaloshinskii-Moriya interaction (DMI) and electrostatic doping (ED) existence characteristics 1D magnons layer stacking FBL. The coexistence DMI ED found enrich topology FBL, yet corresponding do not carry well-defined index. On other hand, show that DMI-free FBL constitute channels for ballistic transport topological magnons. Our theoretical results raise hope towards magnon valleytronic devices based atomically thin magnetic materials.