We investigate the topological properties of a Josephson junction obtained by constraining a two-dimensional electron gas at oxide interface to form a quasi-1D conductor. We reveal an anomalous critical current behaviour with a magnetic field applied perpendicular to the Rashba spin-orbit one. We relate the observed critical current enhancement at small magnetic fields with a non-trivial topology, accompanied by Majorana bound states (MBSs) pinned at the edges of the superconducting leads. Signatures of MBSs also include a sawtooth profile in the current-phase relation. Our findings allow to recognize fingerprints of topological superconductivity in non-centrosymmetric materials and confined systems with Rashba spin-orbit interaction, and to explain recent experimental observations for which a microscopic description is still lacking.
@article{arxiv.2211.15433,
title = {Hallmarks of non-trivial topology in Josephson junctions based on oxide nanochannels},
author = {Alfonso Maiellaro and Jacopo Settino and Claudio Guarcello and Francesco Romeo and Roberta Citro},
journal= {arXiv preprint arXiv:2211.15433},
year = {2023}
}