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AbstractAbstract
[en] This thesis takes place in the field of condensed matter. More precisely, we focus on the finite size effects and the screening effects caused by a STM tip in a quantum wire. For that, we use, first, the Luettinger liquid theory, which allows to describe strongly correlated systems and secondly, the Keldysh formalism, which is necessary to treat the out-of-equilibrium systems. For these studies, we consider, the currant, the noise and the conductance. The noise presents a non-Poissonian behaviour, when finite size effects appear. Through the photo-assisted transport, it is shown that those effects hide the effects of the Coulomb interactions. Considering the proximity between the STM tip, used as a probe or as an injector, and a quantum wire, screening effects appear. We can conclude that they play a similar role to those of Coulomb interactions. (author)
[fr]
Cette these s'inscrit dans le domaine de la physique mesoscopique. Plus particulierement, on s'est interesse aux effets de taille finie et aux effets de l'ecrantage cause par une pointe de STM dans un fil quantique, ceci a travers les comportements du courant, du bruit non-symetrise et de la conductance. Ces etudes reposent sur, d'une part, la theorie des liquides de Luttinger qui permet de decrire les systemes 1D d'electrons fortement correles et d'autre part, le formalisme Keldysh permettant de considerer des situations hors equilibre. Le bruit presente un comportement non poissonien, resultant des effets de taille finie. A travers le transport photo-assiste, il est egalement montre que ces effets masquent ceux des interactions coulombiennes. En considerant la proximite entre la pointe de STM, qui sert de sonde comme d'injecteur d'electrons, et un fil quantique, des effets d'ecrantage apparaissent. Il est montre qu'ils jouent un role similaire a ceux des interactions coulombiennes. (auteur)Original Title
Etudes des effets de taille finie et de l'ecrantage cause par une pointe de STM dans les liquides de Luettinger
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Secondary Subject
Source
19 Jun 2009; 215 p; 188 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; These Docteur, specialite: Physique Theorique
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
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Country of publication
AHARONOV-BOHM EFFECT, CARBON NANOTUBES, CHARGE TRANSPORT, CORRELATION FUNCTIONS, DENSITY OF STATES, DYSON REPRESENTATION, FERMI GAS, GREEN FUNCTION, HAMILTONIANS, HARTREE-FOCK METHOD, NUCLEAR SCREENING, PERTURBATION THEORY, QUANTUM WIRES, SCANNING TUNNELING MICROSCOPY, SPECTRAL FUNCTIONS, TUNNEL EFFECT
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