Interlayer excitons
When two or more individual monolayers are placed together to form an artificial homo- or heterostructure, the real van der Waals (vdW) architecture begins offering reach electronic, optical and magnetic phenomena oftentimes utterly unlike the monolayer case. One notable example is the emergence of a new type of exciton where the electron and the hole are spatially located in different layers. While the formation of these so-called interlayer or indirect excitons is not exclusive to vdW structures such as transition metal dichalcogenides (TMDs) bilayers, the unique properties of the constituent 2D materials stemming from the intrinsic valley physics and the enhanced Coulomb interactions at the 2D limit make for an exciting research journey to set on in the context of the 2D materials field.
