New Electronic States (NEE) Research
Materials adopt extremely varied behaviors because each one of them has an original electronic structure which determines whether it will be, for example, metallic, semiconductor or magnetic. This variety plays a key role in the field of electronics since it allows the realization of a wide range of devices such as field effect transistor, solar cells or magnetic memories. All these properties are consequences of electronic excitations hosted by solids whose characteristic frequencies range from very low frequencies (Hz) to optical frequency via THz or the microwave range (GHz).
Modern science has made it possible to highlight novel and exotic materials with remarkable properties, such as low-dimensional conductors (carbon nanotubes, nanowires, graphene, etc.), topological insulators, superconductors or perovskites. The research within the NEE group aims to highlight and control New Electronic States in these materials by exploring the excitation spectrum through different complementary approaches: the FEMTOAPRES project (Photoemission), TeraX Lab (THz), QCMX (GHz to Hz) and the development of new low frequency sensors. This allows a complete characterization of the electronic properties of these materials since one has access to their band structures, as well as to their collective electronic modes, their properties of quantum coherence and their low energy excitations. To this end, the NEE group also uses innovative materials growth techniques (nanowires, carbon nanotubes, etc.) and the controlled creation of defects by irradiation.
Luca Perfetti (Group coordinator)