Magic-Angle Graphene Superlattices: Pablo Jarillo-Herrero

Описание: Pablo Jarillo-Herrero (MIT) presents his surprising discovery of an ultrathin material consisting of two misaligned sheets of graphene that can be easily converted from being a Mott insulator to a superconductor at the APS March Meeting 2018 in Los Angeles, CA.

-------------------------------------------------
Magic-Angle Graphene Superlattices: a New Platform for Strongly Correlated Physics
-------------------------------------------------

In this talk I will discuss a new platform for strongly correlated physics based on magic-angle graphene superlattices. In particular, I will show that when two graphene sheets are twisted by an angle close to the theoretically predicted ‘magic angle’, the resulting flat band structure near the Dirac point gives rise to a strongly-correlated electronic system. These flat bands exhibit half-filling insulating phases at zero magnetic field, which we show to be a Mott-like insulator arising from electrons localized in the moiré superlattice. Doping away from the Mott-like state, we achieve electrically tunable superconductivity, with many characteristics similar to cuprate superconductivity, including superconducting domes, small Fermi pockets, and strong coupling.