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Quantum Dots from Carbon Nanotube Junctions

Published online by Cambridge University Press:  01 February 2011

Fabrizio Cleri ,
Pawel Keblinski ,
Inkook Jang  and
Susan B. Sinnott
Fabrizio Cleri
Affiliation:
Ente Nuove Tecnologie, Energia e Ambiente (ENEA), Unità Materiali e Nuove Tecnologie, Centro Ricerche Casaccia, 00100 Roma A. D. (Italy)
Pawel Keblinski
Affiliation:
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy12180–3590 (USA)
Inkook Jang
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville 32611–6400 (USA)
Susan B. Sinnott
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville 32611–6400 (USA)
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Abstract

A tight-binding hamiltonian is used to study the electronic properties of covalently-bonded, crossed (5,5) metallic nanotubes with increasing degree of disorder in the junction region. At one extreme, ideal junctions between coplanar nanotubes with a minimal number of topological defects show a good ohmic behavior. Upon increasing disorder, ohmic conduction is suppressed in favor of hopping conductivity. At the opposite extreme, strongly disordered junctions as could be obtained after electron-beam irradiation of overlayed nanotubes, display weak localization and energy quantization, indicating the formation of a quantum dot contacted to metallic nanowires by tunnel barriers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 789 , 2003 , N17.7
Copyright
Copyright © Materials Research Society 2004

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References

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