  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.
