title: Unconventional integer quantum Hall effect in graphene.
abstract: Monolayer graphite films, or graphene, have quasiparticle excitations that can be described by (2+1)-dimensional Dirac theory. We demonstrate that this produces an unconventional form of the quantized Hall conductivity sigma(xy) = -(2e2/h)(2n+1) with n = 0, 1, ..., which notably distinguishes graphene from other materials where the integer quantum Hall effect was observed. This unconventional quantization is caused by the quantum anomaly of the n=0 Landau level and was discovered in recent experiments on ultrathin graphite films.
authors.affiliation: Bogolyubov Institute for Theoretical Physics, Metrologicheskaya Street 14-b, Kiev, 03143, Ukraine. vgusynin@bitp.kiev.ua
authors.forename: V P
authors.initials: VP
authors.lastname: Gusynin
authors.forename: S G
authors.initials: SG
authors.lastname: Sharapov