Theory of the Magnetic-Field-Induced Insulator in Neutral Graphene

Details Theory of the Magnetic-Field-Induced Insulator in Neutral Graphene Theory of the Magnetic-Field-Induced Insulator in Neutral Graphene

2009-09-08

arxiv.org/abs/0909.1362v1

Phys. Rev. B 80, 235417 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 7 figures

Scientific paper

10.1103/PhysRevB.80.235417

Recent experiments have demonstrated that neutral graphene sheets have an insulating ground state in the presence of an external magnetic field. We report on a $\pi$-band tight-binding-model Hartree-Fock calculation which examines the competition between distinct candidate insulating ground states. We conclude that for graphene sheets on substrates the ground state is most likely a field-induced spin-density-wave, and that a charge density wave state is possible for suspended samples. Neither of these density-wave states support gapless edge excitations.

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