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The strong and intermediate coupling physics of magic-angle graphene

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  • UserNick Bultinck, University of Oxford
  • ClockThursday 10 March 2022, 13:15-14:30
  • HouseTheory Library.

If you have a question about this talk, please contact Dr Hannah Price.

Magic-angle twisted bilayer graphene (MATBG) shows insulating behavior at certain integer electron fillings which cannot be accounted for with a single-particle model. In this talk, I will explain what are the theoretically expected spontaneous symmetry-breaking orders that are responsible for this insulating behavior observed in experiments. For a pristine MATBG sample, the physics can be understood from a strong-coupling perspective which identifies the insulators as ‘generalized quantum Hall ferromagnets’ where the electrons completely fill a set of bands with non-zero Chern number. If physically realistic strains in the graphene sheets are taken into account, the strong-coupling picture breaks down and a new symmetry-breaking order called ‘incommensurate KekulĂ© spiral’ order starts to dominate the phase diagram.

This talk is part of the Theoretical Physics Seminars series.

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