Propriétés électroniques et magnétiques des couches moléculaires sur matériaux 2D

par Nianjheng Wu

Projet de thèse en Physique

Sous la direction de Andrew Mayne.

Thèses en préparation à université Paris-Saclay , dans le cadre de École doctorale Ondes et Matière , en partenariat avec Institut des Sciences Moléculaires d'Orsay (laboratoire) et de Faculté des sciences d'Orsay (référent) depuis le 01-02-2019 .

  • Résumé

    Over the last decade, carbon nanotubes and graphene have been widely used to fabricate standard field-effect transistors (FET) and sensors. More recently, these materials have been considered for spintronic applications. Graphene, like carbon nanotubes, exhibits high electron mobility and weak spin-orbit coupling. This means that spin-polarized electrons can travel a long distance in graphene without losing their spin information. However, the weak Spin Orbit Interactions (SOI) precludes the electrically-driven reversal of spins that could lead to graphene or carbon nanotube-based spin-FETs. Beyond qualitative modifications of the transport, surface functionalization can radically change some of the electronic properties of graphene, by inducing both SOI and magnetism.

  • Titre traduit

    Electronic and Magnetic properties of Molecular layers on 2D materials

  • Résumé

    This PhD is part of the Magma ANR project (ANR-2016-CE29-0027), which aims to create novel functionalities in graphene by controlled manipulation of the electron spins. In this PhD, the student will perform experiments to functionalize graphene with arrays of organometallic complexes (metal porphyrins and phthalocyanines) and to study how the molecular networks influence versatile systems with tunable properties involving the spin degree of freedom of the electrons. Depending on their designed structure and properties and their ability to exchange charges with graphene, the molecular complexes may either induce magnetism or Spin-Orbit Interactions in graphene. These issues will be addressed by combining near-field characterization (Scanning Tunnelling Microscopy and Spectroscopy), theory, magnetism and device physics. Low temperature magneto-transport measurements using the superconducting proximity effect will be used to probe the gate-controlled magnetism induced in graphene by the molecular layer.