Applied Physics A

, Volume 69, Issue 3, pp 283–295

Interference and Interaction in multi-wall carbon nanotubes

  • C. Schönenberger
  • A. Bachtold
  • C. Strunk
  • J.-P. Salvetat
  • L. Forró
Regular paper

DOI: 10.1007/s003390051003

Cite this article as:
Schönenberger, C., Bachtold, A., Strunk, C. et al. Appl Phys A (1999) 69: 283. doi:10.1007/s003390051003

Abstract.

We report equilibrium electric resistance R and tunneling spectroscopy (dI/dV)measurements obtained on single multi-wall nanotubes contacted by four metallic Au fingers from above. At low temperature quantum interference phenomena dominate the magnetoresistance. The phase-coherence (lφ)and elastic-scattering lengths (le)are deduced. Because le is of order of the circumference of the nanotubes, transport is quasi-ballistic. This result is supported by a dI/dV spectrum which is in good agreement with the density of states (DOS) due to the one-dimensional subbands expected for a perfect single-wall tube. As a function of temperature T the resistance increases on decreasing T and saturates at ≈1–10 Kfor all measured nanotubes. R(T) cannot be related to the energy-dependent DOS of graphene but is mainly caused by interaction and interference effects. On a relatively small voltage scale of the order ≈10 meV, a pseudogap is observed in dI/dV which agrees with Luttinger-liquid theories for nanotubes. Because we have used quantum diffusion based on Fermi-liquid as well as Luttinger-liquid theory in trying to understand our results, a large fraction of this paper is devoted to a careful discussion of all our results.

PACS: 73.61.Wp; 72.15.Gd; 73.20.Fz; 73.20.At

Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • C. Schönenberger
    • 1
  • A. Bachtold
    • 1
  • C. Strunk
    • 1
  • J.-P. Salvetat
    • 2
  • L. Forró
    • 2
  1. 1.Institut für Physik, Universität Basel, Klingelbergstr. 82, CH-4056 Basel, SwitzerlandCH
  2. 2.Institut de Génie Atomique, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, SwitzerlandCH