Localized plasmons in bilayer graphene nanodisks

Abstract

We study localized plasmonic excitations in bilayer graphene (BLG) nanodisks, comparing AA-stacked and AB-stacked BLG and contrasting the results to the case of two monolayers without electronic hybridization. The electrodynamic response of the BLG electron gas is described in terms of a spatially homogeneous surface conductivity, and an efficient alternative two-dimensional electrostatic approach is employed to carry out all the numerical calculations of plasmon resonances. Due to a unique electronic band structures, the resonance frequency of the traditional dipolar plasmonic mode in the AA-stacked BLG nanodisk is roughly doping independent in the low-doping regime, while the mode is highly damped as the Fermi level approaches the interlayer hopping energy $\gamma$ associated with tunneling of electrons between the two layers. In addition to the traditional dipolar mode, we find that the AB-stacked BLG nanodisk also hosts a new plasmonic mode with energy larger than $\gamma$. This mode can be tuned by either the doping level or structural size, and furthermore, this mode can dominate the plasmonic response for realistic structural conditions.

References in corpus (17)

• The electronic properties of graphene
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
• Dielectric function, screening, and plasmons in 2D graphene
• Graphene Plasmonics for Terahertz to Mid-Infrared Applications
• Graphene Plasmonics: Challenges and Opportunities
• The electronic properties of bilayer graphene
• Dynamical polarization of graphene at finite doping
• Graphene-plasmon polaritons: From fundamental properties to potential applications
• Optical conductivity of bilayer graphene with and without an asymmetry gap
• Nonlocal Response of Metallic Nanospheres Probed by Light, Electrons, and Atoms
• Dynamic Screening and Low Energy Collective Modes in Bilayer Graphene
• Anomalous Reflection Phase of Graphene Plasmons and its Influence on Resonators
• Classical and Quantum Plasmonics in Graphene Nanodisks: the Role of Edge States
• Plasmons in layered structures including graphene
• Plasmonic eigenmodes in individual and bow-tie graphene nanotriangles
• Quantum Junction Plasmons in Graphene Dimers

Cited by in corpus (5)

• Electronic properties of graphene-based bilayer systems
• Quasi-flat plasmonic bands in twisted bilayer graphene
• Fundamental limits to near-field optical response, over any bandwidth
• Limits to the Optical Response of Graphene and 2D Materials
• Experimental demonstration of graphene plasmons working close to the near-infrared window