Suppression of tunneling into multiwall carbon nanotubes - art. no. 166801

We have studied tunneling of electrons into multiwall carbon nanotubes (NTs ) in NT-gold and NT-NT junctions, the latter created by atomic force micros cope manipulation. The tunneling conductance goes to zero as the energy (te mperature and bias) is reduced, and the functional form is consistent with a power law. The exponents depend upon sample geometry. The relationship be tween these results and theories for tunneling into ballistic and disordere d metals is discussed.