Gossamer superconductivity in moire WSe2 bilayer

Recent experiments have identified robust superconductivity in moire ́ bilayer WSe2 for certain twist angles. Here, we propose the gossamer nature of the superconductivity recently discovered at half-filling and zero dis- placement field in twisted WSe2 . By mapping the moire ́ continuum system to an effective extended single-orbital Hubbard model on the triangular lattice, we employ renormalized mean-field theory to investigate the strong- coupling phase diagram. We find that a moderate Coulomb repulsion partially suppresses charge fluctuations while preserving a finite density of mobile doublons and holes. In this regime, the interplay between extended kinetic hoppings and antiferromagnetic superexchange stabilizes a chiral d + id superconducting phase. Our results naturally account for the twist-angle-dependent evolution from a Mott insulator to a superconductor and eventually to a correlated metal. Furthermore, the model demonstrates that this half-filled pairing state vanishes rapidly upon density doping, consistent with experimental observations.

Reference: ArXiv 2605.037662 by H. K. Jin, G. Y. Ji, Z. Wang, J. Wang, and F.C Zhang.