Title: The story of graphene with a twist

Speaker: Dr. Hridis Pal, Georgia Tech. USA

Abstract: Graphene has been at the forefront of research for more than a decade now, thanks to its unusual electronic properties. It is well known that the properties of this single layer material get modified substantially with the addition of a second layer. While the most commonly studied form of graphene bilayers is one where the two layers are arranged in AA or AB fashion, in recent years there has been a surge of interest in structures where the layers are rotated by an arbitrary angle leading to large scale moire patterns. In this talk, I will present the fascinating electronic properties of these systems--in particular, how flat bands emerge due to topological reasons--and show how these systems provide a highly tunable platform to study both nontrivial topology as well as strong correlations.