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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルNanowires and Carbon Nanotubes
ホスト出版物のサブタイトルScience and Applications
出版社Materials Research Society
ページ43-48
ページ数6
ISBN(印刷版)9781604234152
DOI
出版ステータスPublished - 2006 1月 1
イベント2006 MRS Fall Meeting - Boston, MA, United States
継続期間: 2006 11月 272006 11月 29

出版物シリーズ

名前Materials Research Society Symposium Proceedings
963
ISSN(印刷版)0272-9172

Other

Other2006 MRS Fall Meeting
国/地域United States
CityBoston, MA
Period06/11/2706/11/29

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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