Collective excitation of edge-modified graphene nanoribbons

We explored the collective excitation of graphene nanoribbon (GNR) under the influence of edge-modification. The theoretical framework was based on the tight-binding model in conjunction with the dielectric function. We observed unusual plasmon modes associated with collective excitation of the flat bands. Interestingly, these modes are analogous to magnetoplasmons of Landau-quantized electrons. This work provides a unique way to engineer discrete magnetoplasmon-like modes of GNRs in the absence of magnetic field.