Suspended Carbon Nanotube Quantum Wires with Two Gates

Suspended single‐walled carbon nanotube devices comprised of high‐quality electrical contacts and two electrostatic gates per device have been prepared. Compared to nanotubes pinned on substrates, the suspended devices exhibit little hysteresis related to environmental factors and act as cleaner Fab...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2005-01, Vol.1 (1), p.138-141
Main Authors: Cao, Jien, Wang, Qian, Wang, Dunwei, Dai, Hongjie
Format: Article
Language:English
Subjects:
carbon nanotubes
chemical vapor deposition
Electron Transport
Nanotubes, Carbon - chemistry
Nanowires - chemistry
Quantum Dots
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Summary:Suspended single‐walled carbon nanotube devices comprised of high‐quality electrical contacts and two electrostatic gates per device have been prepared. Compared to nanotubes pinned on substrates, the suspended devices exhibit little hysteresis related to environmental factors and act as cleaner Fabry–Perot interferometers or single‐electron transistors. The high‐field saturation currents in the suspended nanotubes related to optical phonon or zone‐boundary phonon scattering are significantly lower due to the lack of efficient heat sinking. The multiple‐gate design may also facilitate future investigations into the electromechanical properties of nanotube quantum systems. Devices comprised of suspended as‐grown single‐walled carbon nanotubes (SWNTs), high‐quality metal electrical contacts, and two electrostatic gates have been prepared (see picture). The SWNT is suspended between two metal contacts and is free of any nanotube–substrate interactions. Such devices are “ultraclean” quantum systems that provide a unique opportunity to investigate the intrinsic properties of SWNTs, such as transport behavior at high bias.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.200400015