Matériaux bidimensionnels, nanoparticules et leurs hétérostructures pour la nanoélectronique et l’électronique de spin

Abstract : This thesis investigates the charge and spin transport processes in 0D, 2D nanostructures and 2D-0D Van der Waals heterostructures (VdWh). The La0.67Sr0.33MnO3 perovskite nanocrystals reveal exceptional magnetoresistances (MR) at low temperature driven by their paramagnetic shell magnetization independently of their ferromagnetic core. A detailed study of MoSe2 field effect transistors enables to elucidate a complete map of the charge injection mechanisms at the metal/MoSe2 interface. An alternative approach is reported for fabricating 2D-0D VdWh suitable for single electron electronics involving the growth of self-assembled Al nanoclusters over the graphene and MoS2 surfaces. The transparency the 2D materials to the vertical electric field enables efficient modulation of the electric state of the supported Al clusters resulting to single electron logic functionalities. The devices consisting of graphene exhibit MR attributed to the magneto-Coulomb effect.
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Louis Donald Mouafo Notemgnou. Matériaux bidimensionnels, nanoparticules et leurs hétérostructures pour la nanoélectronique et l’électronique de spin. Materials Science [cond-mat.mtrl-sci]. Université de Strasbourg, 2019. English. ⟨NNT : 2019STRAE002⟩. ⟨tel-02303052⟩

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