Electronic properties of (n,0) single-walled C nanotubes with Stone-Wales (SW) defects were investigated by use of the tight-binding Green function method with real-space renormalization techniques. It was found that the interaction between two SW defects was long-range, with a characteristic length of several nanometers. The obtained characteristic length, reflecting the effective functional range of topological defects, coincides with recent observations on defects in C nanotubes via scanning tunneling spectroscopy. By means of a monatomic chain model, the long-range interaction was revealed to be general in one-dimensional defected semiconducting systems, which could be equivalently described by a low-barrier quantum tunneling Long-Range Interaction between Stone-Wales Defects in Zig-Zag Single-Walled Carbon Nanotubes. T.Zhou, L.Yang, J.Wu, W.Duan, B.L.Gu: Physical Review B, 2005, 72[19], 193407 (4pp)