Graphene Plasmon-Enhanced Polarization-Dependent Interfacial Charge Transfer Excitons in 2D Graphene-Black Phosphorus Heterostructures in NIR and MIR Regions

In this paper, we investigate graphene plasmon-enhanced polarization-dependent interfacial charge transfer excitons in two-dimensional (2D) heterostructures, i.e., graphene-black phosphorus (G-BP) and graphene-black phosphorus-graphene (G-BP-G), in the near-infrared region (NIR) and mid-infrared (MIR) regions. Theoretical findings show that when G-BP and G-BP-G heterostructures are created, absorption peaks appear in the NIR and MIR when compared to the absorption spectrum of BP alone. Furthermore, these recent absorption peaks are observed to conform to interfacial charge transfer excitons, which are closely contingent on light polarization along the zigzag or armchair edges of BP. Finally, electromagnetic field theory shows that graphene plasmon and graphene plasmon binding between interlayer graphene greatly strengthen these recent interfacial charge transfer excitons. Our results demonstrate BP can be combined with other 2D materials to form a heterostructure, which can have excellent properties of individual materials and possess hybrid physicochemical properties that are not possessed by individual monomers.