2021/09/02 by Thi-Nga Do, Po-Hsin Shih, Godfrey Gumbs +1
Engineering · Materials Science · Physics and Astronomy · #Condensed matter physics #Electron #Enhanced Data Rates for GSM Evolution #Graphene #Graphene nanoribbons #Graphene research and applications #Photonic Crystals and Applications #Physics #Plasmon #Plasmonic and Surface Plasmon Research #Quantum mechanics #Quasiparticle #Superconductivity #cond-mat.mes-hall #physics.comp-ph
paper · pdf · doi:10.1088/1361-648x/ac2330
published as J. Phys.: Condens. Matter 33 485001 (2021)
openalex publication_date 2021/09/02 · arxiv created 2021/09/21 · arxiv updated 2021/09/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The effect of edge modification of armchair graphene nanoribbons (AGNRs) on the collective excitations are theoretically investigated. The tight-binding method is employed in conjunction with the dielectric function. Unconventional plasmon modes and their association with the flat bands of the specially designed AGNRs are thoroughly studied. We demonstrate the robust relationship between the novel collective excitations and both the type and period of the edge modification. Additionally, we reveal that the main features displayed in the (momentum, frequency)-phase diagrams for both single-particle and collective excitations of AGNRs can be efficiently tuned by edge-extended defects. Our obtained plasmon modes are found to be analogous to magnetoplasmons associated with collective excitations of Landau-quantized electrons. This work provides a unique way to engineer discrete magnetoplasmon-like modes of AGNRs in the absence of magnetic field.