Electrical transport through crossed carbon nanotube junctions

We have investigated the electrical transport properties through crossed nanotube junction between two metallic single-walled carbon nanotubes. Depending on the temperature range, the crossed junction exhibits different behaviors. At high temperatures, the crossed junction acts as a tunneling junction and its conductance shows a power-law dependence on the temperature, Gproportional toT(alpha), with alphaapproximate to1. At low temperatures, however, it exhibits different behaviors from the tunnel junction, suggesting the formation of localized states at the crossing. We have also measured the gate-voltage dependence for the crossed junctions and observed quasiperiodic oscillations supporting the existence of localized states formed at the junction. (C) 2003 American Institute of Physics.