Transport study of transition metal dichalcogenide morié superlattices

Morié superlattices formed in van der Waals materials have emerged as a new platform to explore strongly correlated physics and other emergent phenomena in two-dimensional electronic systems. Superconductivity, correlated insulating states, and ferromagnetism have recently been discovered in the twisted bilayer graphene and ABC trilayer graphene/boron nitride systems. In contrast to the graphene systems, in which spin, valley, and layer degeneracies are all present, the spin and layer degeneracies are lifted in semiconducting transition metal dichalcogenide (TMD) heterobilayers by strong spin-orbital interactions and layer asymmetry. The large band mass and band gap of the TMDs also allow the flat bands to be present for a large range of twist angle. In this talk, we will present a transport study of angle aligned WSe₂/WS₂ bilayers and discuss properties of the observed correlated insulating states at half filling (i.e. one particle per morié site).