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Theory of superconductivity of carbon nanotubes and graphene

K. Sasaki·J. Jiang·R. Saito·S. Onari·Y. Tanaka
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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.

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K. Sasaki, J. Jiang, R. Saito, S. Onari, Y. Tanaka. 2006-11-17. Theory of superconductivity of carbon nanotubes and graphene. https://doi.org/10.1143/jpsj.76.033702

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