Abstract
We have determined the screened on-site Coulomb repulsion in graphite and single wall carbon nanotubes by measuring their Auger spectra and performing a theoretical analysis based on an extended Cini-Sawatzky approach [Solid State Commun. 24, 681 (1977); Phys. Rev. Lett. 39, 504 (1977)], where only one fit parameter is employed. The experimental line shape is very well reproduced by the theory, and this allows us to determine the value of the screened on-site repulsion between $2p$ states, which is found to be $2.1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ in graphite and $4.6\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ in nanotubes. The latter is robust by varying the nanotube radius from $1\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.
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