Honeycomb lattice with multiorbital structure: Topological and quantum anomalous Hall insulators with large gaps
Honeycomb lattice with multiorbital structure: Topological and quantum anomalous Hall insulators with large gaps
We construct a minimal four-band model for the two-dimensional (2D) topological insulators and quantum anomalous Hall insulators based on the ${p}_{x}$- and ${p}_{y}$-orbital bands in the honeycomb lattice. The multiorbital structure allows the atomic spin-orbit coupling which lifts the degeneracy between two sets of on-site Kramers doublets ${j}_{z}=\ifmmode\pm\else\textpm\fi{}\frac{3}{2}$ and ${j}_{z}=\ifmmode\pm\else\textpm\fi{}\frac{1}{2}$. …