Extended Data Fig. 5: The origin of equilibrium currents in the compressible and incompressible quantum Hall states.
From: Mapping the twist-angle disorder and Landau levels in magic-angle graphene
a, Semiclassical picture of cyclotron orbits of holes with mutually canceling neighbouring currents, resulting in zero bulk current. b, In the presence of an in-plane electric field Ex (+ and − signs represent external charges) the cyclotron orbits acquire a drift velocity resulting in a non-zero \({J}_{y}^{{\rm{T}}}\) in the incompressible state. c, In the compressible regime the external in-plane electric field is screened by establishing a charge-density gradient, giving rise to \({J}_{y}^{{\rm{NT}}}\) flowing in the opposite direction (cyan arrows).
