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Contribution à la modélisation théorique et à l'étude du transport quantique dans les dispositifs à base de nanotubes de carbone.

Abstract : Carbon nanotubes are quasi-1D structures obtained by rolling a graphene sheet onto a cylinder surface. This determines the chirality and the complete electronic and vibrational band structure of carbon nanotubes. However, due to low dimensionnality of such systems and to the wave nature of electrons, this band structure is strongly modified by applying an external magnetic field, and broken by a random disordered potentiel(loss of translationnal invariance), or by excitation of an inelastic mechanism(electron-phonon interaction). The aim of the following thesis is to explore quantum transport properties in carbon nanotubes, due to the interplay between quantum interferences and interaction processes. We will focus ourselves on disordered carbon nanotubes doped by nitrogen or boron atoms, modelize the disordered hamiltonian and probe scaling laws of conductance. We will also consider the role of a uniform and static magnetic field on transport regimes at low bias(Landau level formation and Aharonov-Bohm oscillation). Inelastic collisions due to electron-optic phonon coupling will finally be considered. Due to the low dimensionnality of carbon nanotubes, the adiabatic approximation fails and a proper transport formalism in Fock space of electrons and phonons has to be considered. In the former studies, an effective microscopic hamiltonian is built and the problem of coherent quantum transport solved numerically or analytically.
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https://tel.archives-ouvertes.fr/tel-00326421
Contributor : Rémi Avriller <>
Submitted on : Friday, October 3, 2008 - 1:00:33 AM
Last modification on : Wednesday, November 4, 2020 - 2:46:21 PM
Long-term archiving on: : Friday, June 4, 2010 - 12:09:38 PM

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  • HAL Id : tel-00326421, version 1

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Rémi Avriller. Contribution à la modélisation théorique et à l'étude du transport quantique dans les dispositifs à base de nanotubes de carbone.. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00326421⟩

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