Corrugation-driven symmetry breaking in magic-angle twisted bilayer graphene

Abstract

Twisted bilayer graphene exhibits superconductivity and other electronic phenomena such as flat bands at specific orientations between the layers; however, the origins of the resulting electronic structure are complex. Here, the authors show theoretically that corrugation in the bilayer system can result in partial filling of the flat bands, which has important implications for the exotic electronic properties that are observed.