Unconventional Integer Quantum Hall effect in graphene
Abstract
Description
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 $σ_{xy} = - (2 e^2/h)(2n+1)$ with $n=0,1,...$, that 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.
4 pages, RevTeX4, 2 EPS figures; version accepted for publication in Physical Review Letters
4 pages, RevTeX4, 2 EPS figures; version accepted for publication in Physical Review Letters