Characterization of nanographite and carbon nanotubes by polarization dependent optical spectroscopy

Alexander Grüneis, Riichiro Saito, Georgii G. Samsonidze, Marcos A. Pimenta, Ado Jorio, Antonio G. Souza Filho, Gene Dresselhaus, Mildred S. Dresselhaus

Research output: Contribution to journalConference article

Abstract

The optical absorption for π electrons as a function of the electron wavevector k is investigated by first order perturbation theory in graphite and single wall carbon nanotubes (SWNTs). The matrix element connecting two states in the valence and conduction bands is found to be significantly anisotropic k-space and polarization dependent. In the case of graphite, the absorption shows a node around the equi-energy contour, and in the case of SWNTs we obtain selection rules that allow only transitions between certain pairs of subbands. The strength of the optical absorption is not only diameter dependent but also chirality dependent. The implications of the optical absorption matrix element on the resonant conditions are discussed.

Original languageEnglish
Pages (from-to)523-528
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume737
Publication statusPublished - 2003 Jul 25
Externally publishedYes
EventQuantum Confined Semiconductor Nanostructures - Boston MA, United States
Duration: 2002 Dec 22002 Dec 5

ASJC Scopus subject areas

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

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