Collective Modes of Massive Dirac Fermions in Armchair Graphene Nanoribbons

Abstract

We report the plasmon dispersion characteristics of intrinsic and extrinsic armchair graphene nanoribbons of atomic width N = 5 using a p_z-orbital tight binding model with third-nearest-neighbor (3nn) coupling. The coupling parameters are obtained by fitting the 3nn dispersions to that of an extended Huckel theory. The resultant massive Dirac Fermion system has a band gap E_g \approx 64 meV. The extrinsic plasmon dispersion relation is found to approach a common dispersion curve as the chemical potential $\mu$ increases, whereas the intrinsic plasmon dispersion relation is found to have both energy and momentum thresholds. We also report an analytical model for the extrinsic plasmon group velocity in the q \rightarrow 0 limit.

References in corpus (13)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Energy Gaps in Graphene Nanoribbons
• Plasmonics in graphene at infra-red frequencies
• Dielectric function, screening, and plasmons in 2D graphene
• Electronic States of Graphene Nanoribbons
• Graphene Terahertz Plasmon Oscillators
• Armchair graphene nanoribbons: Electronic structure and electric field modulation
• Charge response function and a novel plasmon mode in graphene
• Guided plasmons in graphene p-n junctions
• Plasmon dispersion in semimetallic armchair graphene nanoribbons
• An Extended Huckel Theory based Atomistic Model for Graphene Nanoelectronics
• Dielectric properties of multiband electron systems: I - Tight-binding formulation

Cited by in corpus (4)

• Nonlinear response of metallic acGNR to an elliptically-polarized terahertz excitation field
• First-principles study of the terahertz third-order nonlinear response of metallic armchair graphene nanoribbons
• Quantum Size Effects in the Terahertz Nonlinear Response of Metallic Armchair Graphene Nanoribbons
• Collective modes in a Dirac insulator with short range interactions