TY - JOUR
T1 - Quantum anomalous Hall effect in two-dimensional Cu-dicyanobenzene coloring-triangle lattice
AU - Gao, Yixuan
AU - Zhang, Yu Yang
AU - Sun, Jia Tao
AU - Zhang, Lizhi
AU - Zhang, Shengbai
AU - Du, Shixuan
N1 - Publisher Copyright:
© 2020, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - 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.]
AB - 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.]
KW - Kagome lattice
KW - coloring-triangle lattice
KW - organic topological insulators
KW - quantum anomalous Hall effect
UR - http://www.scopus.com/inward/record.url?scp=85083427711&partnerID=8YFLogxK
U2 - 10.1007/s12274-020-2772-2
DO - 10.1007/s12274-020-2772-2
M3 - Article
AN - SCOPUS:85083427711
SN - 1998-0124
VL - 13
SP - 1571
EP - 1575
JO - Nano Research
JF - Nano Research
IS - 6
ER -