Research Article


2020, 13(6): 1571–1575


Quantum anomalous Hall effect in two-dimensional Cudicyanobenzene coloring-triangle lattice

Yixuan Gao1,2, Yu-Yang Zhang1,2,3, Jia-Tao Sun4, Lizhi Zhang1,2 (*), Shengbai Zhang5, and Shixuan Du1,2,3,6 (*)

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1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 CAS Center for Excellence in Topological Quantum Computation, Beijing 100190, China
4 School of Information and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing 100081, China
5 Rensselaer Polytechnic Institute, Troy, New York 12180, USA
6 Songshan Lake Materials Laboratory, Dongguan 523808, China

Keywords: quantum anomalous Hall effect, organic topological insulators, coloring-triangle lattice, Kagome lattice
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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.
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Quantum anomalous Hall effect in two-dimensional Cudicyanobenzene coloring-triangle lattice. Nano Res. 2020, 13(6): 1571–1575

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