We report on the doping dependence of the electronic structure of the valence band of mats of C60 filled single wall carbon nanotubes (C60 peapods) using high resolution photoemission spectroscopy as probe. For the pristine peapods about one third are metallic Tomonaga-Luttinger-Liquids (TLL), which is directly related to a power law scaling in the density of states. The changes in the valence band of these doped one-dimensional nanostructures explicitly show the effect of the dimensionality on the electronic structure. In addition to previous studies we observe a competitive charge transfer to the C60 peas and the SWCNT host. This yields to a more complex doping dependence and a crossover from a TLL behavior to a normal Fermi liquid at much higher doping levels as compared to intercalated SWCNT bundles.
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