In order to investigate the influence of defect distribution upon electronic transport properties, the quantum conductivity of several three-terminated junctions consisting of three semi-infinite long (5,5) nanotubes was studied. The calculation results showed that the distribution of defects in the junction not only affected the conductivity through every branch but also had a shunt effect. That is, when the defect distribution was mainly in one branch, for a large bias voltage the quantum conductivity through the corresponding branch was lower than for other branches. Therefore, the defect distribution could play an important role in adjusting the conductivity of each branch in multi-terminated junctions. Symmetrical Y-junctions still had obvious step-like features in their quantum conductance, similar to single (5,5) nanotubes.

The Influence of Defect on Quantum Conductivity in Three-Terminated Y-(or T) Junction Single-Walled Carbon Nanotube. H.Liu: Physics Letters A, 2005, 339[3-5], 378-86