Electrical transport through carbon nanotube junctions created by   mechanical manipulation
  Using an atomic force microscope we have created nanotube junctions such as buckles and crossings within individual single-wall metallic carbon nanotubes connected to metallic electrodes. The electronic transport properties of these manipulated structures show that they form electronic tunnel junctions. The conductance shows power-law behavior as a function of bias voltage and temperature, which can be well modeled by a Luttinger liquid model for tunneling between two nanotube segments separated by the manipulated junction. 
Henk W.Ch. Postma, Mark de Jonge, Zhen Yao, and Cees Dekker