Multiwalled carbon nanotube: Luttinger versus Fermi liquid - art. no. 195412

We have measured IV curves of multiwalled carbon nanotubes using end contac ts. At low voltages, the tunneling conductance obeys non-Ohmic power law, w hich is predicted both by the Luttinger liquid and the environment-quantum- fluctuation theories. However, at higher voltages we observe a crossover to Ohm's law with a Coulomb-blockade offset, which agrees with the environmen t-quantum-fluctuation theory, but cannot be explained by the Luttinger-liqu id theory. From the high-voltage tunneling conductance we determine the tra nsmission line parameters of the nanotubes.