Stripe antiferromagnetism and chiral superconductivity in tWSe₂

Twisted bilayer WSe₂ near 3.5°-3.65° exhibits superconductivity at zero displacement field, adjacent to a correlated insulating phase, suggesting that the superconductivity is driven by strong electronic correlations. Using a self-consistent Hartree-Fock analysis of a moiré continuum model, we uncover a robust stripe-like spin density wave (SDW) insulating state near $\nu = 1$ that is associated with van Hove singularities near M points. We argue that the spin fluctuations that lead to a SDW state at finite displacement field are responsible for the superconductivity and construct a t-J-U model to analyze possible pairing instabilities. We find that the leading superconducting state is chiral and spontaneously breaks time-reversal symmetry. Our results highlight the competition between stripe-state insulating order and superconductivity. We will discuss possible experimental approaches to identify the chiral phase and study its interplay with correlated insulating behavior.