Variable electron-phonon coupling in isolated metallic carbon nanotubes observed by Raman scattering

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Details zur Publikation

Autor(en): Maultzsch J
Zeitschrift: Physical Review Letters
Verlag: AMERICAN PHYSICAL SOC
Jahr der Veröffentlichung: 2007
Band: 99
Heftnummer: 2
ISSN: 0031-9007


Abstract


We report the existence of broad and weakly asymmetric features in the high-energy (G) Raman modes of freely suspended metallic carbon nanotubes of defined chiral index. A significant variation in peak width (from 12 cm(-1) to 110 cm(-1)) is observed as a function of the nanotube's chiral structure. When the nanotubes are electrostatically gated, the peak widths decrease. The broadness of the Raman features is understood as the consequence of coupling of the phonon to electron-hole pairs, the strength of which varies with the nanotube chiral index and the position of the Fermi energy.



FAU-Autoren / FAU-Herausgeber

Maultzsch, Janina Prof. Dr.
Lehrstuhl für Experimentalphysik

Zuletzt aktualisiert 2018-08-08 um 15:08