Comunicazione
Hallmarks of orbital-flavored Majorana states in Josephson junctions based on oxide nanochannels.
Maiellaro A., Settino J., Guarcello C., Romeo F., Citro C.
Topological superconductivity (TSC) is an exotic phase of matter in which the fully gapped superconducting bulk hosts Majorana bound states protected by non-Abelian statistics and/or symmetries. In condensed matter systems, the realization of TSC has been mainly focused on platforms realized by semiconducting nanowires proximized by a conventional superconductor. On the other hand, very recently, evidence of topological superconductivity has also been discussed at LAO/STO interfaces. In this talk, we present the transport properties of an oxide-based Josephson junction, made by constraining the 2DEG at LAO/STO (001) interface, to form a quasi-1D system. Our main result is that the strong enhancement of the critical current with applied magnetic field can be associated with the appearance of Majorana bound states with an orbital-flavoured internal structure, lacking a counterpart in a single-band model. Our findings demonstrate that some recent experimental evidence of anomalous Josephson pattern is a strong hallmark of topology.