W=0 Pairing in $(N,N)$ Carbon Nanotubes away from Half Filling

Details W=0 Pairing in $(N,N)$ Carbon Nanotubes away from Half Filling W=0 Pairing in $(N,N)$ Carbon Nanotubes away from Half Filling

2002-07-16

arxiv.org/abs/cond-mat/0207385v2

Physical Review B 66, 165434 (2002)

Physics

Condensed Matter

Superconductivity

16 pages, 6 figures

Scientific paper

10.1103/PhysRevB.66.165434

We use the Hubbard Hamiltonian $H$ on the honeycomb lattice to represent the valence bands of carbon single-wall $(N,N)$ nanotubes. A detailed symmetry analysis shows that the model allows W=0 pairs which we define as two-body singlet eigenstates of $H$ with vanishing on-site repulsion. By means of a non-perturbative canonical transformation we calculate the effective interaction between the electrons of a W=0 pair added to the interacting ground state. We show that the dressed W=0 pair is a bound state for resonable parameter values away from half filling. Exact diagonalization results for the (1,1) nanotube confirm the expectations. For $(N,N)$ nanotubes of length $l$, the binding energy of the pair depends strongly on the filling and decreases towards a small but nonzero value as $l \to \infty$. We observe the existence of an optimal doping when the number of electrons per C atom is in the range 1.2$\div$1.3, and the binding energy is of the order of 0.1 $\div$ 1 meV.

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