General Scope: Graphene is a 2D material that has attracted a considerable interest since its discovery in 2005. Its gapless linear band structure that mimics massless Dirac fermions has led to the discovery of a wealth of new exciting transport properties. Moreover, the possibility to engineer very high mobility graphene devices in which electrons can travel in a ballistic fashion makes graphenpar Benjamin Sacepe - Thèses hors de l'EDPIF