Electronic transport and possible superconductivity at van Hove singularities in carbon nanotubes

Y. Yang, G. Fedorov, S. E. Shafranjuk, T. M. Klapwijk, B. K. Cooper, R. M. Lewis, C. J. Lobb, P. Barbara*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Van Hove singularities (VHSs) are a hallmark of reduced dimensionality, leading to a divergent density of states in one and two dimensions and predictions of new electronic properties when the Fermi energy is close to these divergences. In carbon nanotubes, VHSs mark the onset of new subbands. They are elusive in standard electronic transport characterization measurements because they do not typically appear as notable features and therefore their effect on the nanotube conductance is largely unexplored. Here we report conductance measurements of carbon nanotubes where VHSs are clearly revealed by interference patterns of the electronic wave functions, showing both a sharp increase of quantum capacitance, and a sharp reduction of energy level spacing, consistent with an upsurge of density of states. At VHSs, we also measure an anomalous increase of conductance below a temperature of about 30 K. We argue that this transport feature is consistent with the formation of Cooper pairs in the nanotube.

Original languageEnglish (US)
Pages (from-to)7859-7866
Number of pages8
JournalNano letters
Issue number12
StatePublished - Dec 9 2015


  • carbon nanotubes
  • tunable superconductivity
  • van Hove singularities

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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