Apparent re-entrant superconductivity due to supercurrent interference in planar InAs/Al Josephson Junctions

Zero-pi transitions of topological nature have been predicted in hybrid structures involving spin-orbit coupled materials such as InAs and conventional superconductors. A signature of this transition is the closing and reopening of the superconducting gap under the application of an in-plane magnetic field. However, a non-uniform flux density perpendicular to the plane of the junction can also lead to an apparent re-entrant superconductivity in the interference patterns. We present some interference patterns in Josephson junctions based on InAs two-dimensional electron gas and Al and present a model discussing the appearance of nodes due to non-uniform flux density.



Author Contributions : S.M. and S.F. did device fabrication and conducted the experiments. The model was developed by S.A. and V.M. . I.L. and J.S. provided the samples.