Addendum to 'Existence of Dirac cones in the Brillouin zone of diperiodic atomic crystals according to group theory'

摘要

In our paper (Damljanovic and Gajic 2016 J. Phys.: Condens. Matter 28 085502) we have analyzed sufficient conditions for the existence of Dirac cones in the Brillouin zone of non-magnetic, two-dimensional atomic crystals with weak spin-orbit coupling. We have provided a list of diperiodic groups hosting Dirac-like dispersion in the vicinity of Brillouin zone corners (K-points), where the orbital degeneracy at the vertex of the cones is caused by the crystal symmetry. In this addendum, we add to our list three more hexagonal diperiodic groups, in which the mentioned double degeneracy is caused by the time reversal symmetry.