Derivation of the screened Bloch equations and application to carbon nanostructures

Eike Verdenhalven, Rudolf Binder, Andreas Knorr, Ermin Malić

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Optical properties of single-walled semiconducting and metallic carbon nanotubes are significantly influenced by excitonic effects. The excitonic binding energy strongly depends on Coulomb screening. Here, we show-using a non-perturbative single-time equation of motion method-how the momentum-dependent dielectric function (q) for carbon nanotubes can be consistently derived within a microscopic theory. We investigate the influence of the corresponding screening on the absorption spectra of semiconducting and metallic carbon nanotubes. We observe clearly smaller excitonic binding energies for metallic nanotubes arising from an efficient screening stemming from the crossing bands. The presented method can be applied in a straightforward way to calculate the Coulomb screening in other nanostructures, such as graphene and carbon nanoribbons.

Original languageEnglish (US)
Pages (from-to)3-10
Number of pages8
JournalChemical Physics
Volume413
DOIs
StatePublished - Feb 21 2013

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Carbon Nanotubes
Nanostructures
Screening
screening
Carbon
derivation
carbon
carbon nanotubes
Binding energy
binding energy
Graphite
Nanotubes
Equations of motion
Absorption spectra
nanotubes
Momentum
graphene
equations of motion
Optical properties
absorption spectra

Keywords

  • Carbon nanotubes
  • Excitonic effects
  • Metallic and semiconducting
  • Screening

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Derivation of the screened Bloch equations and application to carbon nanostructures. / Verdenhalven, Eike; Binder, Rudolf; Knorr, Andreas; Malić, Ermin.

In: Chemical Physics, Vol. 413, 21.02.2013, p. 3-10.

Research output: Contribution to journalArticle

Verdenhalven, Eike ; Binder, Rudolf ; Knorr, Andreas ; Malić, Ermin. / Derivation of the screened Bloch equations and application to carbon nanostructures. In: Chemical Physics. 2013 ; Vol. 413. pp. 3-10.
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