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The interface between magnetic material and superconductors has long beenpredicted to host unconventional superconductivity, such as spin-tripletpairing and topological nontrivial pairing state, particularly whenspin-orbital coupling (SOC) is incorporated. To identify these novel pairingstates, fabricating homogenous heterostructures which contain such variousproperties are preferred, but often challenging. Here we synthesized atri-layer type van-der Waals heterostructure of MnTe/Bi2Te3/Fe(Te, Se), whichcombined s-wave superconductivity, thickness dependent magnetism and strongSOC. Via low-temperature scanning tunneling microscopy (STM), we observedrobust zero-energy states with notably nontrivial properties and an enhancedsuperconducting gap size on single unit-cell (UC) MnTe surface. In contrast, nozero-energy state was observed on 2UC MnTe. First-principle calculationsfurther suggest the 1UC MnTe has large interfacial Dzyaloshinskii-Moriyainteraction (DMI) and a frustrated AFM state, which could promote non-collinearspin textures. It thus provides a promising platform for exploring topologicalnontrivial superconductivity.

Observation of robust zero-energy state and enhanced superconducting gap in a tri-layer heterostructure of MnTe/Bi2Te3/Fe(Te, Se)