A short review is given on the theoretical and experimental works devoted to nanotube molecular connections. For the present study, several such junctions were generated on the computer and their structures were optimized with the help of empirical atomic potentials. Local electronic densities of states were evaluated in the interfacial regions from a tight-binding Hamiltonian. In some metal-semiconductor hybrids, interesting oscillations of the local density of states take place in front of the semiconducting section. The oscillations are due to interferences between incident and reflected Bloch waves when these cannot propagate in the semiconductor.
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