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Transport électronique dans les nanotubes de carbone; étude sous champ magnétique

Abstract : This thesis is devoted to the study of the electronic transport in carbon nanotubes. In
this scheme, we combine a high magnetic field (60T) with an electrostatic control of the
electronic doping. The goal is to show the key role played by the energy band structure
and the disorder. Several kind of metallic tubes with variable structural quality have
been studied. Depending on the ratio between the elastic mean free path (le) and the
nanotube circumference (L), different regimes appear. When le>L, a ballistic conduction is established and clearly shows the unique role of the
band structure. A complete opening of the energy gap under magnetic field is observed
(Aharonov-Bohm effect, AB). A simulation based on the Landauer formalism explains
the prominent role of the Schottky barrier at the contacts. It is the first experimental
evidence of the Aharonov-Bohm Schottky barrier modulations.
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Contributor : Benjamin Lassagne <>
Submitted on : Friday, December 15, 2006 - 3:43:00 PM
Last modification on : Thursday, April 8, 2021 - 4:16:02 PM
Long-term archiving on: : Thursday, September 20, 2012 - 4:10:27 PM


  • HAL Id : tel-00120612, version 1


Benjamin Lassagne. Transport électronique dans les nanotubes de carbone; étude sous champ magnétique. Physique [physics]. INSA de Toulouse, 2006. Français. ⟨tel-00120612⟩



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