Theory of superconductivity of carbon nanotubes and graphene

Ken Ichi Sasaki, Jie Jiang, Riichiro Saito, Seiichiro Onari, Yukio Tanaka

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We present a new mechanism of carbon nanotube superconductivity that originates from edge states which are specific to graphene. Using on-site and boundary deformation potentials which do not cause bulk superconductivity, we obtain an appreciable transition temperature for the edge state. As a consequence, a metallic zigzag carbon nanotube having open boundaries can be regarded as a natural superconductor/normal metal/superconductor junction system, in which superconducting states are developed locally at both ends of the nanotube and a normal metal exists in the middle. In this case, a signal of the edge state superconductivity appears as the Josephson current which is sensitive to the length of a nanotube and the position of the Fermi energy. Such a dependence distinguishs edge state superconductivity from bulk superconductivity.

Original languageEnglish
Article number033702
Journaljournal of the physical society of japan
Volume76
Issue number3
DOIs
Publication statusPublished - Mar 1 2007

Keywords

  • Carbon nanotube
  • Edge state
  • Graphene
  • Superconducivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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