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Exchange, correlation, and scattering effects on surface plasmons in arm-chair graphene nanoribbons

Title:

Exchange, correlation, and scattering effects on surface plasmons in arm-chair graphene nanoribbons

Bahrami, M. and Vasilopoulos, P. (2017) Exchange, correlation, and scattering effects on surface plasmons in arm-chair graphene nanoribbons. Optics Express, 25 (14). pp. 16840-16853. ISSN 1094-4087

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Official URL: http://dx.doi.org/10.1364/OE.25.016840

Abstract

Using Maxwell’s equations for the incoming and outgoing electromagnetic field, in interaction with a metallic arm-chair graphene nanoribbon (AGNR), and the relationship between the density-density response function and the conductivity, we study surface plasmons (SPs) in a AGNR following the Lindhard, random-phase approximation (RPA), and Hubbard approaches. For transverse magnetic (TM) modes we obtain analytical dispersion relations (DRs) valid for q ≤ kF and assess their width dependence. In all approaches we include screening. In the long-wavelength limit q → 0 there is a small but noticeable difference between the DRs of the three approaches. In this limit the respective, scattering-free conductivities differ drastically from those obtained when scattering by impurities is included. We demonstrate that the SP field is proportional to the square of the quality factor Q. The reflection amplitude shows that metallic AGNRs do not support Brewster angles. In addition, AGNRs do not support transverse electric (TE) SPs.

Divisions:Concordia University > Faculty of Arts and Science > Physics
Item Type:Article
Refereed:Yes
Authors:Bahrami, M. and Vasilopoulos, P.
Journal or Publication:Optics Express
Date:2017
Funders:
  • NSERC (GP0121756)
  • Concordia Open Access Author Fund
Digital Object Identifier (DOI):10.1364/OE.25.016840
ID Code:982792
Deposited By: DANIELLE DENNIE
Deposited On:17 Aug 2017 18:58
Last Modified:18 Jan 2018 17:55

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