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The geometrical structures, electrical properties, and nonlinear optical (NLO) properties of AlNNT–Li and BNNT–Li nanotube systems were investigated by means of the density functional theory (DFT) method. Frontier molecular orbitals and density of states analyses show that adsorption of the Li atom can significantly narrow the wide HOMO–LUMO gaps of pure AlNNT and BNNT. The results reveal that AlNNT–Li...
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