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Carbon Nanotube Heterojunctions: Nanoelectronic Devices

Madhu Menon(a) and Deepak Srivastava(b)*

(a)Department of Physics and Astronomy
University of Kentucky, Lexington, KY 40506
(b)Computational Molecular Nanotechnology Group

This is an abstract for a talk to be given at the Fifth Foresight Conference on Molecular Nanotechnology.

Structural stability of various nanotube junctions are investigated using a generalized tight-binding molecular dynamics (GTBMD) scheme that incorporates non-orthogonality of the orbitals. The junctions investigated include straight and small-angle hetero-junctions of various chiralities and diameters as well as more complex "T-junctions" and "Y-junctions". The latter junctions do not always obey the usual pentagon-heptagon pair rule that characterizes the former junctions. The study of local densities of states (LDOS) reveal many interesting features, most prominent among them being the defect-induced states in the gap. The 3-point junctions are one of the smallest possible tunnel junctions made up entirely of carbon atoms, their use in a net-work of molecular electronics components will be discussed in this paper.

*Corresponding Address:
Deepak Srivastava, NASA Ames Research Center, M/S T27A-1; Moffett Field, CA 94035-1000; telephone: (415) 604-3963; fax: (415) 966-8669; e-mail: deepak@nas.nasa.gov
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