Electron Interactions and Scaling Relations for Optical Excitations in Carbon Nanotubes

Abstract

Recent fluorescence spectroscopy experiments on single wall carbon nanotubes reveal substantial deviations of observed absorption and emission energies from predictions of noninteracting models of the electronic structure. Nonetheless, the data for nearly armchair nanotubes obey a nonlinear scaling relation as a function the tube radius $R$. We show that these effects can be understood in a theory of large radius tubes, derived from the theory of two dimensional graphene where the coulomb interaction leads to a logarithmic correction to the electronic self energy and marginal Fermi liquid behavior. Interactions on length scales larger than the tube circumference lead to strong self energy and excitonic effects that compete and nearly cancel so that the observed optical transitions are dominated by the graphene self energy effects.

arXiv comment4 pages

References in corpus (5)

• Size, Shape and Low Energy Electronic Structure of Carbon Nanotubes
• Excitonic Effects and Optical Spectra of Single-Walled Carbon Nanotubes
• Scaling of excitons in carbon nanotubes
• Marginal Fermi liquid behavior from 2d Coulomb interaction
• The Ratio Problem in Single Carbon Nanotube Fluorescence Spectroscopy

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