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Mise en évidence de la cohérence quantique des conducteurs en régime dynamique

Abstract : This work is devoted to the experimental study of coherent dynamical transport in mesoscopic conductors. We have built a highly sensitive vector analyser at ultra low temperature (30 mK) allowing to mesure for the first time complex admittance of quantum circuit in the frequency range 1-2 GHz with a remarkable phase accuracy. Thus, we validate the theoretical work of A. Prêtre, H. Thomas et M. Büttiker about the coherent AC transport through the serial association of a quantum capacitance and a quantum resistor, the paradigm of the quantum RC circuit. We showed experimentally that the charge relaxation resistance is not the mesoscopic DC resistance which would be expressed in terms of transmission probabilities. This resistance is constante and is only half as large as the resistance quantum which determines the plateaus in quantum point contacts h/2e^2. We have moreover investigate the admittance of a quantum point contact (QPC) and demonstrate an inductive effect of the Hall's barre which connect the QPC to the ohmic contacts. The last part of this thesis refer to an article related to the characterization of the photon statistics emitted by a conductors at the thermal equilibrium. We have demonstrated, with a Hambury Brown & Twiss type experiment on GHz photons, our capability to study photons emitted by quantum conductors.
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Submitted on : Wednesday, February 15, 2006 - 3:20:24 PM
Last modification on : Tuesday, December 8, 2020 - 3:39:58 AM
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  • HAL Id : tel-00011619, version 1


Julien Gabelli. Mise en évidence de la cohérence quantique des conducteurs en régime dynamique. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00011619⟩



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