Journal
PHYSICAL REVIEW B
Volume 79, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.193405
Keywords
Brillouin zones; graphene; honeycomb structures; quasiparticles
Funding
- NSERC of Canada
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It is shown that in the absence of spontaneous symmetry breaking the Dirac cones in the system of interacting electrons on honeycomb lattice are isotropic at low energies. The effect is due to the Z(3) subgroup of the D(3) symmetry group of the dispersion relation of Dirac quasiparticles. Consequences of the violations of the Z(3) or the sublattice symmetry are discussed.
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