Topological Josephson Junctions in Corbino geometry*

One-dimensional hybrid semiconductor/superconductor wires and, more recently, long Josephson junctions are the most versatile synthetic topological superconductors where non-abelian excitations can be realized and thoroughly investigated. In both realizations quasiparticle states appear at the physical boundaries, either at the ends of the nanowires or at the edges of the Josephson junction. Signatures of these states have been observed, studied and investigated by several groups with respect to various parameters such as magnetic field, chemical potential and the superconducting phase difference. In this work we report experimental investigation of Josephson junctions in the Corbino geometry fabricated from InAs/Al heterostructures. These devices are in a long junction regime with periodic boundary conditions. Transport studies of these junctions in a normal regime (zero in-plane magnetic field) and in the regime where some regions of the junction are in a topologically non-trivial regime (non-zero in-plane magnetic field) will be presented.