This work was supported by the Na- tional Natural Science Foundation of China (Grant Nos. 11074176, 10976019 and 51101141), the Research Fund for the Doctoral Pro- gram of Higher Education of China (Grant No. 20100181110080), and the Research Found from Science and Technology on Plasma Physics Laboratory (Grant No. 9140C680502C68254).
The geometries,formationenergies and electronic band structures of (8, 0) and (14, 0) singlewailed carbon nanotubes (SWCNTs) with various defects, inehlding vaeaney, Stone-Wales defect, and octagon pentagon pair...