The role of Van Hove singularities in disorder induced Raman scattering

Jeno Kürti, János Koltai, Viktor Zólyomi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The disorder induced D band in the Raman spectrum of graphite and carbon nanotubes has been shown to originate from a double resonance process, involving a scattering by a phonon, and a scattering by a defect. In the case of carbon nanotubes, the Van Hove singularities are expected to have a significant effect on the D band. We present a detailed study of this effect on the case of a simple one dimensional semiconducting model system, with quadratic electronic and phonon dispersion relations. The D band is calculated by exact integration of the perturbation formulas and the dependence of the position and the intensity on the laser excitation energy and the damping factor describing the finite lifetime is examined in detail. The intensity of the D band shows an extra enhancement when the energy of the incoming or the outgoing photon matches or nearly matches the energy of a Van Hove singularity of the nanotube.

Original languageEnglish
Title of host publicationELECTRONIC PROPERTIES OF NOVEL NANOSTRUCTURES
Subtitle of host publicationXIX International Winterschool/Euroconference on Electronic Properties of Novel Materials
Pages416-419
Number of pages4
DOIs
Publication statusPublished - Sep 27 2005
EventELECTRONIC PROPERTIES OF NOVEL NANOSTRUCTURES: XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials - Kirchberg, Tirol, Austria
Duration: Mar 12 2005Mar 19 2005

Publication series

NameAIP Conference Proceedings
Volume786
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherELECTRONIC PROPERTIES OF NOVEL NANOSTRUCTURES: XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials
CountryAustria
CityKirchberg, Tirol
Period3/12/053/19/05

Keywords

  • D band
  • Van Hove singularity
  • double resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Kürti, J., Koltai, J., & Zólyomi, V. (2005). The role of Van Hove singularities in disorder induced Raman scattering. In ELECTRONIC PROPERTIES OF NOVEL NANOSTRUCTURES: XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials (pp. 416-419). (AIP Conference Proceedings; Vol. 786). https://doi.org/10.1063/1.2103899