Recent experimental research progress of two-dimensional van der Waals semiconductor moir? superlattices

A moire superlattice can be formed by overlaying two atomically thin van der Waals materials with arotation angle or with a lattice mismatch. Since the discovery of correlated insulators and superconductivity inmagic angle twisted bilayer graphene, constructing moire superlattices by various two-dimensional (2D) van derWaals materials and studying their novel properties emerge as a hot topic and research frontier in condensedmatter physics. Here we review the recent experimental progress of 2D transition metal dichalcogenide moiresuperlattices. In this system, the formation of moire flat band does not rely on certain magic angles.Experimentally, a series of correlated electron states and topological states have been discovered and confirmed.Further theoretical and experimental studies can find a wealth of emergent phenomena caused by the combinedinfluence of strong correlation and topology in transition metal dichalcogenide moire superlattice