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Mécanismes de decohérence dans les conducteurs mésoscopiques / Decoherence mechanisms in mesocopic conductors

Abstract : Electronic quantum phase coherence results in interferences in mesoscopic metal circuits. The first experiments realized during this thesis explore the interaction mechanisms that limit the electronic phase coherence in non-superconducting (normal) metals: measurements of phase coherence time and energy exchange reveal the major role played by magnetic impurities in the Kondo regime. In superconducting metals, due to the pairing order, electrons adopt a macroscopic quantum state: "coherence" is then obtained for this state involving a large number of electrons. We have, in this case, probed the predicted equivalence of the decoherence induced by a magnetic field and a supercurrent using density of states measurements. In a system made of a normal metal in contact with superconductors, the propagation of the superconducting order in the normal part is limited by the decoherence of single electrons, as revealed in a last experiment.
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https://tel.archives-ouvertes.fr/tel-00003518
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Submitted on : Thursday, October 9, 2003 - 4:41:42 PM
Last modification on : Friday, May 29, 2020 - 4:02:17 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 10:50:10 AM

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  • HAL Id : tel-00003518, version 1

Citation

Anne Anthore. Mécanismes de decohérence dans les conducteurs mésoscopiques / Decoherence mechanisms in mesocopic conductors. Condensed Matter [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2003. English. ⟨tel-00003518⟩

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