University of Birmingham > Talks@bham > Theoretical Physics Seminars > The strong and intermediate coupling physics of magic-angle graphene

## The strong and intermediate coupling physics of magic-angle grapheneAdd to your list(s) Download to your calendar using vCal - Nick Bultinck, University of Oxford
- Thursday 10 March 2022, 13:15-14:30
- Theory 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 Kekulé spiral’ order starts to dominate the phase diagram. This talk is part of the Theoretical Physics Seminars series. ## This talk is included in these lists:Note that ex-directory lists are not shown. |
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