Condensed Matter Theory Seminar - Patrick Ledwith - “Bridging Hubbard and quantum Hall physics in twisted bilayer graphene”

We will discuss a model for the twisted bilayer graphene flat bands that centers the concentration of charge density and, relatedly, the concentration of Berry flux. After establishing good quantitative agreement with more microscopic models, we will show how the model hosts parametrically decoupled flavor moments. These flavor moments are tied to Wannier states that are power-law delocalized, with infinite localization length, that nonetheless have parametrically small overlap with each other. We conclude by discussing some experimental implications for this picture.