Abstract Submitted to the NANOTUBE-99 Workshop:

We have investigated the non-linear transport properties of a doped nanotube junction. The doping causes charge transfer to or from each side of the nantoube to dopant atoms or the substrate. Interesting nonlinear features have been observed and will be explained within a simple tight-binding model. The effect of electron interactions have also been included by considering a Hubbard Hamiltonian. At U=3, we obtain the mean-field ground state to be antiferromagnetic for both armchair and zigzag tubes. Conductance and I-V curves were computed within the mean-field approximation. The results are compared to the U=0 case.

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