Theoretical approach to electronic screening and correlated superconductivity in carbon nanotubes
S. Bellucci, M. Cini, P. Onorato, E. Perfetto
DOI 10.1103/PhysRevB.75.014523 · Physical Review B
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Abstract
A theoretical analysis of the superconductivity observed recently in carbon nanotubes is proposed. We argue that ultrasmall (diameter ∼0.4nm) single wall carbon nanotubes (with transition temperature Tc∼15K) and entirely end-bonded multiwalled ones (Tc∼12K) can superconduct by an electronic mechanism, basically the same in both cases. By a Luttinger liquidlike 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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