Zero-bias anomaly and possible superconductivity in single-walled carbon nanotubes

Jian Zhang*, Alexander Tselev, Yanfei Yang, Kyle Hatton, Paola Barbara, Serhii Shafraniuk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We report measurements of field-effect transistors made of isolated single-walled carbon nanotubes contacted by superconducting electrodes. For large negative gate voltage, we find a dip in the low-bias differential resistance. Remarkably, this dip persists well above the superconducting transition temperature of the electrodes, indicating that it is not caused by superconducting proximity effect from the electrodes. This conclusion is supported by measurements on carbon nanotubes contacted by normal electrodes showing similar features. One possible explanation is superconductivity in the nanotubes, occurring when the gate voltage shifts the Fermi energy into van Hove singularities of the electronic density of states.

Original languageEnglish (US)
Article number155414
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
StatePublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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