Emergent multi-field interaction in a magnetic quasi-two-dimensional WSe2/SrCoO2.5/2DEG heterojunction

Abstract

WSe₂-based heterostructures are extensively enhanced by dielectric and interfacial engineering for high-performance photodetectors. However, it is difficult to integrate a magnetic three-dimensional (3D) thin film on the two-dimensional (2D) van der Waals heterostructure. In this study, a magnetic 2D p-WSe₂/n-2DEG heterostructure with an inserted epitaxial SrCoO_2.5 thin film is fabricated, and a p–n heterojunction is formed via an Ar⁺-ion-bombardment process. The fabricated device with a typical long depletion region responds to a broad spectral range from 447–808 nm within the wide temperature range of 10–300 K. In the dark and under light illumination, the magneto-optical response can be realized due to the self-charging process in the device. Furthermore, the adjustable multistate can be expected under multi-field interaction on the heterojunction, which can be controlled by the control signal as the light ON/OFF switching, bias, and magnetic field. Based on the experimental results and process simulation, it is demonstrated that the heterojunction with an optimized magnetic SrCoO_2.5 design holds promise as a multimode logic gate, which can be implemented with complementary 2D/3D semiconductor design and fabrication processes.