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Schematics of our experiments. (A) Graphene capacitors. Graphene crystal (blue hexagonal layer) is contacted by a gold pad. Second electrode is deposited onto thin hBN (purple). (B) Schematic band diagram at zero bias. (C) Same as (B) but at a finite bias. (D) Band diagram at finite B with the Fermi energy μ in graphene at a filling factor ν = 2. Each LL is shown to be 4× degenerate.
