Quantum anomalous Hall effect in two-dimensional Cu-dicyanobenzene coloring-triangle lattice

Yixuan Gao, Yu Yang Zhang, Jia Tao Sun, Lizhi Zhang*, Shengbai Zhang, Shixuan Du*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

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. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1571-1575
Number of pages5
JournalNano Research
Volume13
Issue number6
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • Kagome lattice
  • coloring-triangle lattice
  • organic topological insulators
  • quantum anomalous Hall effect

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