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On-Site Repulsion as the Source of Pairing in Carbon Nanotubes and Intercalated Graphite
Enrico Perfetto, Gianluca Stefanucci, Michele Cini
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 H…
"Spin-Disentangled" Exact Diagonalization of Repulsive Hubbard Systems: Superconducting Pair Propagation
Michele Cini, Gianluca Stefanucci, Enrico Perfetto +1
By a novel exact diagonalization technique we show that bound pairs propagate between repulsive Hubbard clusters in a superconducting fashion. The size of the matrices that must be…
W=0 Pairing in Carbon Nanotubes away from Half Filling
Enrico Perfetto, Gianluca Stefanucci, Michele Cini
We use the Hubbard Hamiltonian on the honeycomb lattice to represent the valence bands of carbon single-wall nanotubes. A detailed symmetry analysis shows that the mode…