The TeraFERMI beamline as a powerful tool for nonlinear studies on Dirac materials

TeraFERMI is the THz beamline of the FERMI Free Electron Laser. The beamline is based on a Coherent Transition Radiation source providing intense and broadband THz pulses in the MV/cm range. These fields are used to achieve THz control of matter and to push materials well into their nonlinear regime. A class of materials particularly studied at TeraFERMI is that of topological insulators. Thanks to their Dirac massless carriers, topological insulators show nonlinear THz behavior, similarly to the case of graphene. I will discuss in this presentation our most recent results on the THz control of plasmons in the Bi2Se3 topological insulator, and more in general, on the study of quantum materials with THz synchrotron sources.