Local twist-angle maps in magic-angle twisted bilayer graphene reveal 0.1-degree variations and gradients that generate unscreened electric fields and bulk quantum Hall edge states.
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Mapping the twist angle and unconventional Landau levels in magic angle graphene
Local twist-angle maps in magic-angle twisted bilayer graphene reveal 0.1-degree variations and gradients that generate unscreened electric fields and bulk quantum Hall edge states.