We investigate the electronic and magnetic properties of hydrogenated carbonnanotubes using ab initio spin-polarized calculations within both the localdensity approximation (LDA) and the generalized gradient approximation (GGA).We find that the combination of charge transfer and carbon network distortionmakes the spin-polarized flat-band appear in the tube's energy gap. Variousspin-dependent ground state properties are predicted with the changes of theradii, the chiralities of the tubes and the concentration of hydrogen (H). Itis found that strain or external electric field can effectively modulate theflat-band spin-splitting, and even induce an insulator-metal transition.
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