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Transistors à molécule unique : des effets Kondo exotiques à la spintronique moléculaire

Abstract : The aim of molecular spintronic, a rapidly emerging field, is to gather the specific tools, both experimental and theoretical, of different themes : molecular magnetism, spintronic and molecular electronic. In order to implement my Phd project, we had first to create a transistor in which the central part is a single molecule. This was achieved through the use of the electromigration technique, a difficult choice as implemented in a dilution cryostat. Indeed, our goal was to perform experiments at few tens of milliKelvins, and under high magnetic field [0, ±9 T ]. Through experiments with fullerene molecules, also known as C60, we have studied the electronic interactions between a nano-sized object and metallic electrodes. Combining very low temperatures and molecular properties (degenerate electronic levels, high charging energy) allowed us to observe a quantum phase transition between two magnetic states with different symmetries. We also provided strong experimental evidences for the observation of an under-screened Kondo effect. The last part of this thesis focused on the study of electronic transport through the molecular magnet N@C60. It consists of a nitrogen atom located inside a fullerene. By performing different types of magnetic spectroscopies, we quantified interactions between this atom and the conduction electrons carried by the C60 cage.
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https://tel.archives-ouvertes.fr/tel-00456601
Contributor : Nicolas Roch <>
Submitted on : Wednesday, March 10, 2010 - 2:55:17 PM
Last modification on : Monday, December 7, 2020 - 6:02:02 PM
Long-term archiving on: : Thursday, September 23, 2010 - 11:48:32 AM

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  • HAL Id : tel-00456601, version 2

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Nicolas Roch. Transistors à molécule unique : des effets Kondo exotiques à la spintronique moléculaire. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00456601v2⟩

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