Key points are not available for this paper at this time.
We report on the unusual nature of the =0 state in the integer quantum Hall effect (QHE) in graphene and show that electron transport in this regime is dominated by counterpropagating edge states. Such states, intrinsic to massless Dirac quasiparticles, manifest themselves in a large longitudinal resistivity ₗₗ/e^2, in striking contrast to ₗₗ behavior in the standard QHE. The =0 state in graphene is also predicted to exhibit pronounced fluctuations in ₗₘ and ₗₗ and a smeared zero Hall plateau in ₗₘ, in agreement with experiment. The existence of gapless edge states puts stringent constraints on possible theoretical models of the =0 state.
Abanin et al. (Fri,) studied this question.