On-Site Repulsion as the Source of Pairing in Carbon Nanotubes and Intercalated Graphite

Details On-Site Repulsion as the Source of Pairing in Carbon Nanotubes and Intercalated Graphite On-Site Repulsion as the Source of Pairing in Carbon Nanotubes and Intercalated Graphite

2002-12-05

arxiv.org/abs/cond-mat/0212122v1

European Physical Journal B 30, 139 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1140/epjb/e2002-00367-6

We show that different non-conventional superconductors have one fundamental feature in common: pair eigenstates of the Hamiltonian are repulsion-free, the W=0 pairs. In extended Hubbard models, pairing can occur for resonable parameter values. For $(N,N)$ nanotubes the binding energy of the pair depends strongly on the filling and decreases towards a reduced but nonzero value for the graphite sheet $N \to \infty$.

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