Speaker
Description
Symmetry determines forms of band structures in the vicinity of special points in the reciprocal space of one-, two- and three-dimensional materials. After short introduction to the complete classification of linear dispersions in 2D materials,$^1$ we will focus on a particular example. A tight binding model on a crystal with four sites per primitive cell that belongs to grey layer single group $pbma$ (45.2.315 or $pbma1’$ in the magnetic layer groups notation of Ref. [2]) is calculated. Fortune teller states are obtained in the Brillouin zone corners, as predicted$^{3,1}$ by group theory for non-magnetic materials with negligible spin-orbit coupling. We will discuss possible realizations of this model in realistic and hypothetical materials.
References
1. N. Lazić, V. Damljanović and M. Damnjanović, arXiv: 2108.11733 (2021).
2. D. B. Litvin, Acta Cryst. A 61, 382 (2005).
3. V. Damljanović, I. Popov and R. Gajić, Nanoscale 9, 19337 (2017).
