Moiré bands of twisted WSe₂: from topology induced quantum fluctuations to topological superconductivity

Superconductivity in strongly correlated systems is often accompanied by a variety of electron orders and correlated quantum dynamics. As such, readily tunable material platforms are ideal to explore its realization and its interplay with general correlation physics. Twisted bilayer WSe2 has recently emerged as such a platform. The discovery of superconductivity [1-2] at relatively high temperatures, reaching as much as a few percent of the Fermi scale, has sparked significant interest; in smaller twist angles, transport reveals Kondo-lattice-like signatures. These observations suggest a nontrivial interplay between topology, spin-orbit coupling, and electronic interactions. In this talk, I will present our recent progress on the underlying correlation physics based on the notion of topology-induced quantum fluctuations in twisted WSe2 [3-5]. Using two types of Kondo lattice t-J models derived for the different band topology, we investigate the possible superconducting pairing states, which features a natural mixing of p ± ip and d∓id components. These chiral superconducting states are topological, as confirmed by Wilson-loop calculations of the Bogoliubov quasiparticles, which show nontrivial winding and robust edge modes. I will discuss the experimental implications of these results and the connections they suggest between moiré superconductivity and related phenomena in bulk quantum materials.