Regensburg 2016 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 12: Postersession DS

DS 12.35: Poster

Montag, 7. März 2016, 17:00–19:00, Poster A

Relation between the symmetry of diperiodic atomic crystals and the existence of Dirac cones in their energy spectrum — •Vladimir Damljanovic and Rados Gajic — Institute of Physics Belgrade, Belgrade, Serbia

We have determined [1] sufficient conditions for the appearance of s=1/2 Dirac cones in any diperiodic, non-magnetic atomic crystal in which the spin-orbit coupling is negligible. Our group theoretical analysis of all 80 diperiodic groups, shows that combined time-reversal and crystal symmetry allows the existence of Dirac cones in the vicinity of K-points in the Brillouin zone, for systems belonging to certain hexagonal diperiodic groups. We have illustrated our results by a tight-binding example.

[1] V. Damljanović, R. Gajić: "Existence of Dirac cones in Brillouin zone of diperiodic atomic crystals according to group theory", arXiv: 1510.09065v1