title: Quantum Hall effect in twisted bilayer graphene.
abstract: We address the quantum Hall behavior in twisted bilayer graphene transferred from the C face of SiC. The measured Hall conductivity exhibits the same plateau values as for a commensurate Bernal bilayer. This implies that the eightfold degeneracy of the zero energy mode is topologically protected despite rotational disorder as recently predicted. In addition, an anomaly appears. The densities at which these plateaus occur show a magnetic field dependent offset. It suggests the existence of a pool of localized states at low energy, which do not count towards the degeneracy of the lowest band Landau levels. These states originate from an inhomogeneous spatial variation of the interlayer coupling.
authors.affiliation: Max-Planck-Institut für Festköperforschung, Stuttgart, Germany.
authors.forename: Dong Su
authors.initials: DS
authors.lastname: Lee
authors.forename: Christian
authors.initials: C
authors.lastname: Riedl
authors.forename: Thomas
authors.initials: T
authors.lastname: Beringer
authors.forename: A H
authors.initials: AH
authors.lastname: Castro Neto
authors.forename: Klaus
authors.initials: K
authors.lastname: von Klitzing
authors.forename: Ulrich
authors.initials: U
authors.lastname: Starke
authors.forename: Jurgen H
authors.initials: JH
authors.lastname: Smet