Dissipative Quantum Hall Effect in Graphene near the Dirac Point

Details Dissipative Quantum Hall Effect in Graphene near the Dirac Point Dissipative Quantum Hall Effect in Graphene near the Dirac Point

2007-02-06

arxiv.org/abs/cond-mat/0702125v1

Phys. Rev. Lett. 98, 196806 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pgs, 4 fgs

Scientific paper

10.1103/PhysRevLett.98.196806

We report on the unusual nature of nu=0 state in the integer quantum Hall effect (QHE) in graphene and show that electron transport in this regime is dominated by counter-propagating edge states. Such states, intrinsic to massless Dirac quasiparticles, manifest themselves in a large longitudinal resistivity rho_xx > h/e^2, in striking contrast to rho_xx behavior in the standard QHE. The nu=0 state in graphene is also predicted to exhibit pronounced fluctuations in rho_xy and rho_xx and a smeared zero Hall plateau in sigma_xy, in agreement with experiment. The existence of gapless edge states puts stringent constraints on possible theoretical models of the nu=0 state.

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