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The calculated band structures of the pristine (a) (5,5) and (b) (9,0) BN nanotubes.
(a) Calculated band structure of the (5,5) nanotube with a boron atom substituted by carbon and (b) the band structure of (9,0) nanotube with a nitrogen substituted by carbon. Solid lines and + represent the bands of spin-up and spin-down electrons, respectively. The Fermi level is denoted by the dotted line.
Majority and minority spin densities of states of the carbon doped (a) (5,5) and (b) (9,0) BN nanotubes. The Fermi energy is indicated by the vertical dashed line.
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