A Photoemission Study of Potassium-Doped Single Wall Carbon Nanotubes

Abstract

We report on the doping dependence of the electronic structure of the valence band of mats of single wall carbon nanotubes (SWCNT) using high resolution photoemission spectroscopy as probe. For the pristine SWCNT 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. At low doping we observe a crossover from a TLL behavior to a normal Fermi liquid whereas at high doping levels at low binding energy a Fermi level is found.