Physics

# Twisted multilayer graphene

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Science  30 Aug 2019:
Vol. 365, Issue 6456, pp. 879-880
DOI: 10.1126/science.365.6456.879-b

Since the recent discovery of superconductivity in twisted bilayer graphene, physicists have been exploring other twisted heterostructures, including those in which two bilayers of graphene are twisted with respect to each other. These experiments have shown signatures of exotic states, inspiring theorists to try to understand their properties. Liu et al. undertook a theoretical study of the general case of two graphene multilayers, each of which could contain an arbitrary number of graphene monolayers, twisted with respect to each other. They found that such heterostructures retained the approximately flat bands characteristic of twisted bilayer graphene at the same “magic” twist angle. Additionally, twisted multilayer graphene showed interesting topological properties that depended on the number and stacking of monolayers in each multilayer.

Phys. Rev. X 9, 031021 (2019)