Nano-optical study of Moire superlattice domains in twisted graphene heterostructures*

Twisted graphene heterostructure have attracted a considerable amount of attention, realizing a plethora of physical phenomena including strongly interacting correlated states, superconductivity, magnetism and more. In this work we used several nano-optical techniques to study the formation and reconstruction of domain walls in several twisted graphene heterostructures. The techniques are uniquely suited to provide a nanometric spatial map of the domains, over an entire flake scale, which allowed us to study domain formation and internal structure on all relevant scales, and to gain insight into the reconstruction problem in several system of interest, including the twisted bilayer graphene and the twisted double bilayer graphene.