Band-structure modulation in carbon nanotube T junctions

We show that the band structure of metallic carbon nanotubes can be dramatically altered by the local electrostatic field. This is realized by coupling chemically functionalized nanotubes to form T junctions. The bar of the T is the conducting channel and the leg of the T is used for local gating. T...

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Bibliographic Details
Published in:Physical review letters 2004-06, Vol.92 (24), p.246802.1-246802.4, Article 246802
Main Authors: CHIU, Po-Wen, KAEMPGEN, Martti, ROTH, Siegmar
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Nanotubes
Physics
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Summary:We show that the band structure of metallic carbon nanotubes can be dramatically altered by the local electrostatic field. This is realized by coupling chemically functionalized nanotubes to form T junctions. The bar of the T is the conducting channel and the leg of the T is used for local gating. Transport measurements reveal that an energy gap develops upon application of a local electric field in both devices with or without linker molecules at the junction. We propose that the mechanism of the band gap modulation in the T junctions without linker molecules is the field effect, with the linker molecules introducing additional electromechanical and chemical effects.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.246802