  Luttinger liquid behavior was observed in a crossed junction formed with two
metallic multi-wall carbon nanotubes whose differential conductance vanished
with the power of bias voltage and temperature. With applying constant voltage
or current to one of the two carbon nanotubes in a crossed geometry, the
electrical transport properties of the other carbon nanotube were affected
significantly, implying there exists strong correlation between the carbon
nanotubes. Such characteristic features are in good agreement with the
theoretical predictions for the crossed two Luttinger liquids.
