Mesure dispersive des propriétés radio-fréquences de la supraconductivité induite par effet de proximité du graphène couplé à un résonateur sur puce et étude d'un supraconducteur plastique à base de graphène déposé sur un substrat de parylène et décoré par des billes d'étain

par Pauline Ronseaux

Projet de thèse en Physique de la Matière Condensée et du Rayonnement

Sous la direction de Vincent (phys) Bouchiat et de Julien Renard.

Thèses en préparation à Grenoble Alpes , dans le cadre de Physique , en partenariat avec Institut Néel (laboratoire) depuis le 23-09-2015 .


  • Résumé

    The electronic properties of graphene, a monolayer of graphite, are relatively well understood in the DC regime after 10 years of active research. Nevertheless its properties in the high- frequency limit (above 1 GHz for instance) have only recently been highlighted. Its unique geometry (purely 2D) combined with an exceptional charge carrier mobility make graphene a wonder material to realize new devices working in this microwave limit. The observation of new physical phenomena in such devices is the aim of this thesis. First, the realization of radiofrequency cavities containing superconducting graphene will be carried out. Graphene can indeed be made superconducting using superconducting islands. This is a know-how of the laboratory that is unique in the world [All12,Han14]. Besides a better understanding of superconductivity in this new system, we expect to be able to strongly tune the resonance frequency of the cavity by changing the kinetic inductance of graphene with a gate voltage. A second part of the thesis will aim at probing the superconducting proximity effect in tin decorated graphene deposited on parylene. The work will be mainly experimental. It will include nanofabrication and electrical measurements in cryogenic conditions.

  • Titre traduit

    Measurement of adiofrequency properties of proximity superconducting graphene coupled to an on-chip resonator and study of a platic-like superconducteur based on graphene deposited on parylene substrate and decorated by superconducting droplets


  • Résumé

    The electronic properties of graphene, a monolayer of graphite, are relatively well understood in the DC regime after 10 years of active research. Nevertheless its properties in the high- frequency limit (above 1 GHz for instance) have only recently been highlighted. Its unique geometry (purely 2D) combined with an exceptional charge carrier mobility make graphene a wonder material to realize new devices working in this microwave limit. The observation of new physical phenomena in such devices is the aim of this thesis. First, the realization of radiofrequency cavities containing superconducting graphene will be carried out. Graphene can indeed be made superconducting using superconducting islands. This is a know-how of the laboratory that is unique in the world [All12,Han14]. Besides a better understanding of superconductivity in this new system, we expect to be able to strongly tune the resonance frequency of the cavity by changing the kinetic inductance of graphene with a gate voltage. A second part of the thesis will aim at probing the superconducting proximity effect in tin decorated graphene deposited on parylene. The work will be mainly experimental. It will include nanofabrication and electrical measurements in cryogenic conditions.