Fate of Dirac Points in a Vortex Superlattice
Strongly Correlated Electrons
2011-10-20 v2 Quantum Physics
Abstract
We consider noninteracting fermions on the honeycomb lattice in the presence of a magnetic vortex superlattice. It is shown that depending on the superlattice periodicity, a gap may open at zero energy. We derive an expression of the gap in the small-flux limit but the main qualitative features are found to be valid for arbitrary fluxes. This study provides an original example of a metal-insulator transition induced by a strongly modulated magnetic field in graphene. At the same time our results directly apply to Kitaev's honeycomb model in a vortex superlattice.
Cite
@article{arxiv.1107.0143,
title = {Fate of Dirac Points in a Vortex Superlattice},
author = {M. Kamfor and S. Dusuel and K. P. Schmidt and J. Vidal},
journal= {arXiv preprint arXiv:1107.0143},
year = {2011}
}
Comments
5 pages, 3 figures, published version