Collaboration of intervalley-coherent AFM order and topological superconductivity in twisted WSe₂

The recent observation of superconductivity in the vicinity of correlated metallic (insulating) states has established twisted bilayers of WSe₂ as an exciting platform to study the interplay of strong electron-electron interactions and topology in a moiré flat band system. In this work, we study the emergence of electronic ordering in the presence of gate-screened Coulomb interactions from first-principle by constructing moiré Wannier orbitals that faithfully capture the bandstructure and topology of the system. Using unbiased functional renormalization group calculations, we find that intervalley-coherent AFM order and chiral, mixed-parity d/p-wave superconductivity collaborate along the displacement field tunable van-Hove singularity. Our microscopic approach underlines the importance of intervalley-coherent AFM spin fluctuations in the formation of superconductivity in Θ=5.08° twisted WSe₂ and points out distinct signatures to be verified in future experimental measurements in samples within the twist angle range of Θ=5°...4°.