Excitonic absorption spectra of metallic single-walled carbon nanotubes

Ermin Malic, Janina Maultzsch, Stephanie Reich, and Andreas Knorr
Phys. Rev. B 82, 035433 – Published 22 July 2010

Abstract

We present microscopic calculations of the absorption spectra of metallic single-walled carbon nanotubes. We address the controversial question of the excitonic binding energies in metallic nanotubes as well as the excitonic character of higher transitions. In spite of the strong screening, we observe binding energies in the range of 100 meV for metallic nanotubes with diameters in the range of 1–2.2 nm. Characteristic features of the absorption spectra, such as peak splitting and an asymmetric peak shape, are observed. The splitting is due to the trigonal warping effect. The peak shoulder at high energies is a result of an overlap of the excitonic excitation with the free-particle Van Hove singularity. Furthermore, we find higher transitions to be also significantly influenced by excitons. Our approach is based on density matrix, which allows the investigation of the chirality and diameter dependence of the excitonic binding energy for the first four optical transitions for a variety of different metallic and semiconducting nanotubes.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 3 March 2010

DOI:https://doi.org/10.1103/PhysRevB.82.035433

©2010 American Physical Society

Authors & Affiliations

Ermin Malic1,*, Janina Maultzsch2, Stephanie Reich3, and Andreas Knorr1

  • 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik von Halbleitern, Technische Universität Berlin, 10623 Berlin, Germany
  • 2Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
  • 3Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany

  • *ermin.malic@tu-berlin.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 82, Iss. 3 — 15 July 2010

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×