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Mathematics of magic angles in a model of twisted bilayer graphene

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(2020)cite arxiv:2008.08489Comment: We added a trace formula summing up powers of magic angles and elaborated on our numerical methods.

Abstract

We provide a mathematical account of the recent Physical Reviews Letter by Tarnopolsky--Kruchkov--Vishwanath. The new contributions are a spectral characterization of magic angles, its accurate numerical implementation and an exponential estimate on the squeezing of all bands as the angle decreases. Pseudospectral phenomena due to the non-hermitian nature of operators appearing in the model play a crucial role in our analysis.

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