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Proceedings Paper

Shot noise in carbon nanotubes
Author(s): Philippe-Emmanuel Roche; Mathieu Kociak; Meydi Ferrier; Sophie Gueron; Alik Kasumov; Bertrand Reulet; Helene Bouchiat
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Paper Abstract

Carbon nanotubes may constitute the ultimate conducting wires for nano-electronics, with their diameters as small as a few tens of atoms and their length of order one micrometer. Because of the particular band structure of graphite, nanotubes have at most two conducting channels, which makes them a one dimensional conductor with very exotic properties. Experimental investigations have indeed shown non conventional features, such as non-ohmic behavior, superconductivity and an ability to carry a huge current density. We have carried out shot noise measurements on nanotubes which are suspended between metallic electrodes. One consequence of the suspended geometry is a very low 1/f noise, thereby enabling the extraction of shot noise. In bundles of nanotubes, we find a reduction of shot noise by more than a factor 100 compared to the full noise 2.e.I expected for uncorrelated electrons. A low noise is also found in an isolated single wall nanotube. In a simple non-interacting-electron picture, such a low shot noise implies that the electrical conduction through a bundle of nanotubes is concentrated in a few ballistic tubes. Another interpretation however would be that a substantial fraction of the tubes conduct with a strong reduction of the effective charge (more than a factor 50) due to electron-electron interaction.

Paper Details

Date Published: 8 May 2003
PDF: 12 pages
Proc. SPIE 5115, Noise and Information in Nanoelectronics, Sensors, and Standards, (8 May 2003); doi: 10.1117/12.488854
Show Author Affiliations
Philippe-Emmanuel Roche, LPS/Univ. Paris-Sud (France)
CNRS, Grenoble (France)
Mathieu Kociak, LPS/Univ. Paris-Sud (France)
CEA Saclay (France)
Meydi Ferrier, LPS/Univ. Paris-Sud (France)
Sophie Gueron, LPS/Univ. Paris-Sud (France)
Alik Kasumov, LPS/Univ. Paris-Sud (France)
Institute of Microelectronics Technology and High Purity Materials (Russia)
RIKEN--The Institute of Physical and Chemical Research (Japan)
Bertrand Reulet, LPS/Univ. Paris-Sud (France)
Yale Univ. (United States)
Helene Bouchiat, LPS/Univ. Paris-Sud (France)

Published in SPIE Proceedings Vol. 5115:
Noise and Information in Nanoelectronics, Sensors, and Standards
Laszlo B. Kish; Frederick Green; Giuseppe Iannaccone; John R. Vig, Editor(s)

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