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The modeling of carbon nanotube-metal contacts is important from both basicand applied view points. For many applications, it is important to designcontacts such that the transmission is dictated by intrinsic properties of thenanotube rather than by details of the contact. In this paper, we calculate theelectron transmission probability from a nanotube to a free electron metal,which is side-contacted. If the metal-nanotube interface is sufficientlyordered, we find that k-vector conservation plays an important role indetermining the coupling, with the physics depending on the area of contact,tube diameter and chirality. The main results of this paper are: (i)conductance scales with contact length, a phenomena that has been observed inexperiments and (ii) in the case of uniform coupling between metal andnanotube, the threshold value of the metal Fermi wave vector (below whichcoupling is insignificant) depends on chirality. Disorder and small phasecoherence length relax the need for k-vector conservation, thereby making thecoupling stronger

Coupling of carbon nanotubes to metallic contacts