Electronic screening and correlated superconductivity in carbon nanotubes

Abstract

A theoretical analysis of the superconductivity observed recently in Carbon nanotubes is proposed. We argue that ultra-small (diameter $\sim 0.4nm$) single wall carbon nanotubes (with transition temperature $T_c\sim 15^{o}K$) and entirely end-bonded multi-walled ones ($T_c\sim 12^{o}K$) can superconduct by an electronic mechanism, basically the same in both cases. By a Luttinger liquid -like approach, one finds enhanced superconducting correlations due to the strong screening of the long-range part of the Coulomb repulsion. Based on this finding, we perform a detailed analysis on the resulting Hubbard-like model, and calculate transition temperatures of the same order of magnitude as the measured ones.

6 pages, 1 figure, PACS: 71.10.Pm,74.50.+r,71.20.Tx, to appear in Phys. Rev. B

References in corpus (2)

• Suppression of electron-electron repulsion and superconductivity in Ultra Small Carbon Nanotubes
• A theory of superconductivity in multi-walled carbon nanotubes

Cited by in corpus (2)

• Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy
• Influence of dimensionality on superconductivity in carbon nanotubes