Steplike dispersion of the intermediate-frequency Raman modes in semiconducting and metallic carbon nanotubes
نویسندگان
چکیده
C. Fantini,1 A. Jorio,1 M. Souza,1 R. Saito,2 Ge. G. Samsonidze,3 M. S. Dresselhaus,3 and M. A. Pimenta1 1Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 30123-970, Brazil 2Department of Physics, Tohoku University and CREST JST, Aoba Sendai 980-8578, Japan 3Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA Received 28 April 2005; published 22 August 2005
منابع مشابه
Doping in carbon nanotubes probed by Raman and transport measurements.
In situ Raman experiments together with transport measurements have been carried out on carbon nanotubes as a function of gate voltage. In metallic tubes, a large increase in the Raman frequency of the G(-) band, accompanied by a substantial decrease of its linewidth, is observed with electron or hole doping. In addition, we see an increase in the Raman frequency of the G(+) band in semiconduct...
متن کاملTrigonal warping effect of carbon nanotubes
Chirality-dependent van Hove singularities ~vHs! of the one-dimensional electronic density of states ~DOS! are discussed in connection with resonant Raman spectroscopy. The effect of trigonal warping on the energy dispersion relations near the Fermi energy splits the peaks of the density of states for metallic nanotubes, and the magnitude of this effect depends on the chiral angle of the carbon...
متن کاملElectronic Raman Scattering On Individual Semiconducting Single Walled Carbon Nanotubes
We report experimental measurements of electronic Raman scattering by electrons (holes) in individual single-walled carbon nanotubes (SWNTs) under resonant conditions. The Raman scattering at low frequency range reveals a single particle excitation feature. And the dispersion of electronic structure around the center of Brillouin zone of a semiconducting SWNT (14, 13) is extracted.
متن کاملSpectroelectrochemistry of carbon nanostructures.
This review is focused on charge-transfer reactions at carbon nanotubes and fullerenes. The spectroelectrochemistry of fullerenes deals with the spin states of fullerenes, the role of mono-anions and the reactivity of higher charged states in C60. The optical (Vis-NIR) spectroelectrochemistry of single-walled carbon nanotubes (SWNTs) follows changes in the allowed optical transitions among the ...
متن کاملRaman modes of metallic carbon nanotubes
The anomalous resonant behavior of the tangential Raman modes of carbon nanotubes has been studied in the critical region of laser energies 1.7–2.2 eV. The special enhancement of the Raman modes is explained by a model that takes into account the transition between the singularities in the one-dimensional density of electronic states for the metallic nanotubes and the distribution of diameters ...
متن کامل