Excitation and propagation of surface plasmons in intrinsic and extrinsic graphene are analyzed from the fundamental point of view, using time-dependent density functional theory in linear response regime. Density functional calculations, being set up from first principles, do include anisotropic effects in the unique electronic structure of graphene that cause remarkable consequences even on the THz band. The main signature of this anisotropy is the occurrence of two distinct plasmon modes over a frequency range of 1 to 300THz, where most photonic devices currently operate with large bandwidths and low losses. Further anisotropic features are inherent to the different electromagnetic response of graphene to positive and negative doping concentrations. The Dirac-cone approximation provides a simplified insight, assuming an isotropic graphene band structure near the Fermi level, which is found to be reliable at probing frequencies below ~20 THz and doping levels associated to Fermi energy shifts below/above ±0.3 eV. In these limits, a continuous integral expression derived from the Kubo formula represents an easy-to-use tool capable of catching the main essence of the process.

Plasmon modes in extrinsic graphene: Ab initio simulations vs semi-classical models / Sindona, Antonello; Pisarra, Michele; Mencarelli, Davide; Pierantoni, Luca; Bellucci, Stefano. - STAMPA. - none:(2016), pp. 125-144. (Intervento presentato al convegno Workshop on Fundamental and Applied Nanoelectromagnetics, 2015 tenutosi a blr nel 2015) [10.1007/978-94-017-7478-9_7].

Plasmon modes in extrinsic graphene: Ab initio simulations vs semi-classical models

MENCARELLI, Davide;PIERANTONI, Luca;
2016-01-01

Abstract

Excitation and propagation of surface plasmons in intrinsic and extrinsic graphene are analyzed from the fundamental point of view, using time-dependent density functional theory in linear response regime. Density functional calculations, being set up from first principles, do include anisotropic effects in the unique electronic structure of graphene that cause remarkable consequences even on the THz band. The main signature of this anisotropy is the occurrence of two distinct plasmon modes over a frequency range of 1 to 300THz, where most photonic devices currently operate with large bandwidths and low losses. Further anisotropic features are inherent to the different electromagnetic response of graphene to positive and negative doping concentrations. The Dirac-cone approximation provides a simplified insight, assuming an isotropic graphene band structure near the Fermi level, which is found to be reliable at probing frequencies below ~20 THz and doping levels associated to Fermi energy shifts below/above ±0.3 eV. In these limits, a continuous integral expression derived from the Kubo formula represents an easy-to-use tool capable of catching the main essence of the process.
2016
NATO Science for Peace and Security Series B: Physics and Biophysics
9789401774888
9789401774888
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/239073
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