Excitation and propagation of surfaces waves in graphene and graphene nanoribbons are analyzed, within a frequency band of 1 to 300 THz, based on time dependent density functional theory, in linear response regime. The key outputs of the simulation is the ab-initio complex impeance of the materials. This is shown to tend to a continuous integral relations in graphene, when the valence and conduction bands is treated within the conical approximation, in agreement with a widely used construction derived from the Kubo formula. Non negligible differences are observed between the ab-initio and continuous methods at frequencies larger than a few tens of THz, where the conical approximation reaches its limits of validity. The main conclusion of the study is that a novel conductivity concept is introduced, which represents a fundamental improvement with respect to some commonly used methods in electromagnetic simulations, working at THz frequencies. These tools may open the way to properly analyze graphene related materials, hethero-structures and interfaces.

Electromagnetic characterization of graphene and graphene nanoribbons via ab-initio permittivity simulations / Bellucci, S.; Sindona, A.; Mencarelli, Davide; Pierantoni, Luca. - (2015), pp. 926-929. (Intervento presentato al convegno 17th International Conference on Electromagnetics in Advanced Applications, ICEAA 2015 tenutosi a "Torino Incontra" Congress Center, Via Nino Costa 8, ita nel 2015) [10.1109/ICEAA.2015.7297251].

Electromagnetic characterization of graphene and graphene nanoribbons via ab-initio permittivity simulations

MENCARELLI, Davide;PIERANTONI, Luca
2015-01-01

Abstract

Excitation and propagation of surfaces waves in graphene and graphene nanoribbons are analyzed, within a frequency band of 1 to 300 THz, based on time dependent density functional theory, in linear response regime. The key outputs of the simulation is the ab-initio complex impeance of the materials. This is shown to tend to a continuous integral relations in graphene, when the valence and conduction bands is treated within the conical approximation, in agreement with a widely used construction derived from the Kubo formula. Non negligible differences are observed between the ab-initio and continuous methods at frequencies larger than a few tens of THz, where the conical approximation reaches its limits of validity. The main conclusion of the study is that a novel conductivity concept is introduced, which represents a fundamental improvement with respect to some commonly used methods in electromagnetic simulations, working at THz frequencies. These tools may open the way to properly analyze graphene related materials, hethero-structures and interfaces.
2015
9781479978069
9781479978069
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/234305
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact