Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes

Georgii G. Samsonidze, Eduardo B. Barros, Hyungbin Son, Riichiro Saito, Gene Dresselhaus, Mildred S. Dresselhaus

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


The electron-phonon coupling in two-dimensional graphite (graphene sheet) and metallic single-wall carbon nanotubes (SWNTs) is analyzed. In the graphene sheet the G-band phonon mode induces oscillations of the Fermi points, while the G′-band phonon mode opens a dynamical (oscillating with the phonon frequency) band gap, and accordingly, both phonon modes exhibit Kohn anomalies. Similarly, truly metallic armchair SWNTs undergo Peierls transitions driven by the G-- and G′-band phonon modes both of which open a dynamical band gap. In addition, the dynamical band gap induces a non-linear dependence of the phonon frequencies on the doping level and gives rise to strong anharmonic effects in the graphene sheet and metallic SWNTs.

Original languageEnglish
Title of host publicationNanowires and Carbon Nanotubes
Subtitle of host publicationScience and Applications
PublisherMaterials Research Society
Number of pages6
ISBN (Print)9781604234152
Publication statusPublished - 2006 Jan 1
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Nov 29

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2006 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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