Abstract: 

It has become possible in recent years to fabricate and manipulate two-dimensional nanomaterials in the laboratory that are as thin as one to few atomic layers. The reduced dimensionality gives rise to unique physical and chemical properties that are not found in traditional bulk materials. In this talk, I will focus on the physics associated with moiré patterns in van der Waals bilayers using twisted bilayer graphene and the heterostructurs of transition metal dichalcogenides as examples. An introduction to the intriguing physical properties that have been found in these bilayer systems will be given.