Manuel Bibes1
CNRS/Thales1
Two-dimensional electron gases based on KTaO<sub>3</sub> (KTO) have recently emerged as an exciting new platform for oxide electronics and spintronics since they possess a large low-temperature mobility, a large Rashba spin-orbit coupling and are superconducting with a critical temperature of about 2 K for (111) oriented samples. The 2DEGs can be defined from KTO single crystals substrates by growing on top a perovskite film or a reactive metal such as Eu or Al (which oxidizes and creates oxygen vacancies in the KTO, doping it with electrons). We will shed light on the physics of this system through a combination of advanced measurements including ARPES, resonant microwave transport, harmonic transport and electron tunneling. We will finally discuss the role of the magnetic vs nonmagnetic overlayer materials and how to introduce ferroelectricity in the system.