Quantum Transport in a Multiwalled Carbon Nanotube

Abstract

We report on electrical resistance measurements of an individual carbon\nnanotube down to a temperature T=20 mK. The conductance exhibits a ln T\ndependence and saturates at low temperature. A magnetic field applied\nperpendicular to the tube axis, increases the conductance and produces\naperiodic fluctuations. The data find a global and coherent interpretation in\nterms of two-dimensional weak localization and universal conductance\nfluctuations in mesoscopic conductors. The dimensionality of the electronic\nsystem is discussed in terms of the peculiar structure of carbon nanotubes.\n