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Static electronic polarizability $$\alpha$$ α and second hyperpolarizability $$\gamma$$ γ of semiconducting and conducting carbon nanotubes with radius up to 7.5 Å are evaluated using the coupled-perturbed Hartree–Fock/Kohn–Sham scheme, as implemented in the periodic CRYSTAL14 code, and a split-valence basis set. Two density functionals, namely LDA (pure local) and B3LYP (hybrid),...
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