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There has recently been a surge of interest in studying the superconductingdiode effect (SDE) analogous to semiconducting circuits where the junctionshows nonreciprocal response depending on the current direction. The SDE couldbe observed in systems where the time reversal and inversion symmetries arebroken. Here, we observe the SDE in epitaxial Al-InAs Josephson junctions (JJs)with strong Rashba spin-orbit coupling (SOC), and show that this effectstrongly depends on the orientation of the in-plane magnetic field. In thepresence of strong magnetic field, we observe a change of sign in the SDE.Simulation and measurement of supercurrent suggest that depending on thesuperconducting widths, $W_S$, this sign change may not necessarily be relatedto $0-\pi$ or topological transitions. We find the strongest sign change injunctions with narrow $W_S$ is consistent with SOC-induced asymmetry of thecritical current under magnetic-field inversion, while in wider $W_S$, the signreversal could be related to $0-\pi$ transitions and topologicalsuperconductivity

Superconducting Diode Effect Sign Change in Epitaxial Al-InAs Josepshon Junctions