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Near a magic twist angle, the lowest energy conduction and valence bands ofbilayer graphene moir\'e superlattices become extremely narrow. The banddispersion that remains is sensitive to the moir\'e's strain pattern, nonlocaltunneling between layers, and filling-factor dependent Hartree and exchangeband renormalizations. In this article we analyze the influence of theseband-structure details on the pattern of flavor-symmetry-breaking observed inthis narrow band system, and on the associated pattern of Fermi surfacereconstructions revealed by weak-field-Hall and Schubnikov-de Haasmagneto-transport measurements.

Weak-field Hall Resistivity and Spin/Valley Flavor Symmetry Breaking in Magic-Angle Twisted Bilayer Graphene