Phonon Trigonal Warping Effect in Graphite and Carbon Nanotubes

Ge G. Samsonidze, R. Saito, A. Jorio, A. G.Souza Filho, A. Grüneis, M. A. Pimenta, G. Dresselhaus, M. S. Dresselhaus

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The one-dimensional structure of carbon nanotubes leads to quantum confinement of the wave vectors for the electronic states, thus making the double resonance Raman process selective, not only of the magnitude, but also of the direction of the phonon wave vectors. This additional selectivity allows us to reconstruct the phonon dispersion relations of 2D graphite, by probing individual single wall carbon nanotubes of different chiralities by resonance Raman spectroscopy, and using different laser excitation energies. In particular, we are able to measure the anisotropy, or the trigonal warping effect, in the phonon dispersion relations around the hexagonal corner of the Brillouin zone of graphite.

Original languageEnglish
Pages (from-to)4
Number of pages1
JournalPhysical review letters
Volume90
Issue number2
DOIs
Publication statusPublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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