Expérimental
The recent discovery of new oxide 2DEGs based on KTaO3 (e.g. LaAlO3/KTaO3) pave the way towards the observation of Majorana Zero Energy Modes (MZMs) in quantum oxide matter. The project aims at fabricating and studying field-effect mesoscopic nanodevices in KTaO3 oxide interfaces, in which superconductivity and spin-orbit coupling could be tuned at the relevant scales using a set of nano-gates. We will start by investigating the superconducting phase of the 2DEGs by combining various experimental techniques. This includes low temperature electronic transport, microwave conductivity, and tunnelling spectroscopy. Our primary objectives are to ascertain the nature of the superconducting state—distinguishing between single-gap and multigap scenarios—and to elucidate the symmetry of the order parameter(s). This foundational knowledge will serve as the basis to understand the origin of superconductivity in KTO 2DEGs, and the interplay between Rashba spin-orbit coupling and superconductivity in the context of topological superconducting phases. Simultaneously, we will embark on the creation and analysis of Josephson junctions and SQUID devices, in which we will look for signatures of topological superconductivity. Our ultimate objective involves the fabrication of topological 1D nanowires, wherein we will search for robust signatures of Majorana zero modes (MZMs). This quest will be pursued through tunneling spectroscopy of edge states and microwave experiments.