We theoretically discuss the emergence of fractional Shapiro steps in a Josephson junction created by confining a two-dimensional electron gas at an oxide interface. This phenomenon is induced by an alternating current of proper amplitude and frequency and can be tuned by a magnetic field applied perpendicular to the Rashba spin-orbit axis. The presence of fractional Shapiro steps can be associated with the creation of Majorana bound states at the boundaries of the superconducting leads. Our findings represent a route for the identification of topological superconductivity in non-centrosymmetric materials and confined systems in the presence of spin--orbit interaction, offering also new insights into recently explored frameworks.
@article{arxiv.2407.09923,
title = {Probing Topological Superconductivity of oxide nanojunctions using fractional Shapiro steps},
author = {Claudio Guarcello and Alfonso Maiellaro and Jacopo Settino and Irene Gaiardoni and Mattia Trama and Francesco Romeo and Roberta Citro},
journal= {arXiv preprint arXiv:2407.09923},
year = {2024}
}