Volume 61, Number 4, February 2003
|Page(s)||513 - 519|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 February 2003|
Correlation gap in armchair carbon nanotubes
Institut de Physique Théorique, Université de Lausanne CH-1015 Lausanne, Switzerland
Corresponding author: Thomas.Gloor@ipt.unil.ch
Accepted: 9 December 2002
We revisit the problem of the correlation gap in armchair carbon nanotubes, that would be metallic in the absence of electron-electron correlations. We attack the problem in the context of a Hubbard model with on-site repulsion U only, and we show that the scaling of the gap as predicted by Balents and Fisher (Phys. Rev. B, 55 (1997) R11973) can only be valid if U is not too large, even for very large values of n. Using Hartree-Fock calculations and renormalisation group arguments we derive the scaling of the gap as a function of n for a given value of U. Possible applications for the magnitude of the correlation gap in armchair carbon nanotubes will be discussed.
PACS: 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 71.20.Tx – Fullerenes and related materials; intercalation compounds / 72.80.Rj – Fullerenes and related materials
© EDP Sciences, 2003
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