My researches have so far focused on the experimental study of the properties of low dimensional electronic systems. They mainly aim at characterizing two-dimensional electron 2 gases (2DEG) in various environements: semi-conducting structures, atomically thin layered materials such as graphene, transition metal dichalcogenides or other van der Waals heterostructures, and on “topological insulator” surfaces. Among the numerous issues raised by these systems, I fixed a particular attention on the quantum Hall effect and the spin and valley properties, closely related to the many-body effects arising from electron-electron interactions. This includes ferromagnetic quantum Hall states, fractional quantum Hall (FQH) states (associated with nontrivial “anyonic” and “non-abelian anyonic” quantum statistics), electron (Wigner-like) solids, quantum spin Hall state… I additionally pay a great attention to all new emerging 2D materials (semiconducting, superconducting, magnetic), with interaction and/or Moiré potential driven electronic phases.