Journal
PHYSICAL REVIEW B
Volume 80, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.235417
Keywords
charge density waves; electronic structure; graphene; ground states; HF calculations; quantum Hall effect; sheet materials; spin density waves; tight-binding calculations
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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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