Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy

Details Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy

2007-10-19

arxiv.org/abs/0710.3721v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.233408

We have determined the screened on-site Coulomb repulsion in graphite and single wall carbon nanotubes by measuring their Auger spectra and performing a new theoretical analysis based on an extended Cini-Sawatzky approach where only one fit parameter is employed. The experimental lineshape is very well reproduced by the theory and this allows to determine the value of the screened on-site repulsion between $2p$ states, which is found to be 2.1 eV in graphite and 4.6 eV in nanotubes. The latter is robust by varying the nanotube radius from 1 to 2 nm.

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