Moiré Mott Correlated Mosaics in Twisted Bilayer 1T-TaS2.

The tunability and twist engineering of van der Waals materials enable the emergence of electronic states not present in individual monolayers. Among them, monolayer 1T-TaS2 is a well-known Mott insulating system, whose star-of-David charge density wave reconstruction realizes an emergent triangular lattice of local magnetic moments. Interestingly, in its bulk form, the insulating gap is not correlation-driven but stems from interlayer coupling. Here, we exploit the stacking-dependent nature of the insulating gap to show that, in twisted 1T-TaS2 bilayers, the spatially dependent competition between many-body and single-particle gaps creates Mott-trivial mosaic superlattices, featuring regions with local magnetic moments and nonmagnetic insulating regions. We further demonstrate the tunability of the mosaic correlated state with an interlayer bias, giving rise to controllable charge transfer and quenching of correlations. Our results establish twisted 1T-TaS2 as a flexible platform to engineer mixed spatially modulated correlated insulating phases, arising from the moiré profile.