Moiré flat bands in twisted 2D hexagonal vdW materials

Abstract Moiré superlattices (MSL) in twisted bilayer graphene (TBG) and its derived structures can host exotic correlated quantum phenomena because the narrow moiré flat minibands those systems effectively enhance electron-electron interaction. Correlated are also observed 2H-transitional metal dichalcogenides MSL. However, number of that have been explored experiments still very limited. Here we theoretically investigate a series two-dimensional (2D) hexagonal materials beyond TBG at fixed angles 7.34 ∘ 67.34 with 22 2D van der Waals layered commonly studied experiments. First-principles calculations employed to systemically study these systems. We find bands bandwidth generally exist Some such as In 2 Se 3 , InSe, GaSe, GaS PtS even ultra-flat less than 20 meV for large angles, which makes them especially appealing further experimental investigations. analysis characters provide guidance exploration MSL could strong electron correlations.