Lattice-Induced Double-Valley Degeneracy Lifting in Magnetic Field in Graphene

Details Lattice-Induced Double-Valley Degeneracy Lifting in Magnetic Field in Graphene Lattice-Induced Double-Valley Degeneracy Lifting in Magnetic Field in Graphene

2007-07-03

arxiv.org/abs/0707.0466v4

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.100.176404

We show that the recently discovered double-valley splitting of the low-lying Landau level(s) in the Quantum Hall Effect in graphene can be explained as perturbative orbital interaction of intra- and inter-valley microscopic orbital currents with a magnetic field. This effect is provided by the translational-non-invariant terms corresponding to graphene's crystallographic honeycomb symmetry but do not exist in the relativistic theory of massless Dirac Fermions in Quantum Electrodynamics. We discuss recent data in view of these results.

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