Igor F. Herbut
Published 2009-03-03, updated 2009-05-19Version 2
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.
Comments: 2 RevTex pages; stylistic changes, published version
Journal: Physical Review B, vol. 79, 193405 (2009)
Dirac electrons in a Kronig-Penney potential: dispersion relation and transmission periodic in the strength of the barriers
Revealing the spatial nature of sublattice symmetry
Snell's Law for Spin Waves
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