Electronic screening and correlated superconductivity in carbon nanotubes

Details Electronic screening and correlated superconductivity in carbon nanotubes Electronic screening and correlated superconductivity in carbon nanotubes

2006-12-04

arxiv.org/abs/cond-mat/0612075v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.75.014523

A theoretical analysis of the superconductivity observed recently in Carbon nanotubes is proposed. We argue that ultra-small (diameter $ \sim 0.4 nm$) 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.

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