%0 Journal Article
%A Gao,Yixuan
%A Zhang,Yu-Yang
%A Sun,Jia-Tao
%A Zhang,Lizhi
%A Zhang,Shengbai
%A Du,Shixuan
%T Quantum anomalous Hall effect in two-dimensional Cudicyanobenzene coloring-triangle lattice
%J Nano Research
%D 2020
%V 13
%N 6
%P 1571¨C1575
%R 10.1007/s12274-020-2772-2
%U https://doi.org/10.1007/s12274-020-2772-2
%X Magnetic two-dimensional (2D) topological insulators with spontaneous magnetization have been predicted to host quantum anomalous
Hall effects (QAHEs). For organic topological insulators, the QAHE only exists in honeycomb or Kagome organometallic lattices
based on theoretical calculations. Recently, coloring-triangle (CT) lattice has been found to be mathematically equivalent to a Kagome
lattice, suggesting a potential 2D lattice to realize QAHE. Here, based on first-principles calculations, we predict an organometallic
CT lattice, Cu-dicyanobenzene (DCB), to be a stable QAH insulator. It exhibits ferromagnetic (FM) properties as a result of the
charge transfer from metal atoms to DCB molecules. Moreover, based on the Ising model, the Curie temperature of the FM ordering
is calculated to be around 100 K. Both the Chern numbers and the chiral edge states of the semi-infinite Cu-DCB edge structure,
which occur inside the spin-orbit coupling band gap, confirm its nontrivial topological properties. These make the Cu-DCB CT lattice
an ideal candidate to enrich the family of QAH insulators.
%K quantum anomalous Hall effect, organic topological insulators, coloring-triangle lattice, Kagome lattice