Recently, Professor Ren Junfeng and his team published a paper entitled "Realization of Yin-Yang kagome bands and tunable quantum anomalous" in Applied Physics Letters, an international top journal in the field of applied physics Hall effect in monolayer V3Cl6 "academic paper. Shandong Normal University is the sole author of the paper, with Master student Chen Fanzheng as the first author and Professor Ren Junfeng as the corresponding author.

The realization of quantum anomalous Hall effect (QAHE) contributes to the development of the next generation of low-power electronic devices and spin devices. kagome lattice materials become an important platform for QAHE research due to the existence of kagome band in its electronic structure. However, materials with kagome bands are rare. Based on a compact bound (TB) model, we propose a yin-yang kagome band structure characterized by two stable enantiomeric kagome bands by setting the nearest neighbor transition integral with opposite symbols. The TB model is further verified by designing a single-layer V3Cl6. In V3Cl6, the three V atoms are located in different coordination environments, so opposite transition integrals can be achieved between their two orthogonal d orbitals. We find that the two enantiomeric bands in single-layer V3Cl6 have opposite numbers after considering spin-orbit coupling. The number and topological properties can be regulated by doping holes or adjusting the direction of magnetization, so that tunable QAHE can be achieved in single-layer V3Cl6. This work provides a feasible way to realize the yin-yang kagome band structure and its tunable QAHE.

Figure 1.(a) Schematic diagram of the lattice structure of single-layer V3Cl6. (b) Schematic diagram of transitions between dxz and dyz orbits in single-layer V3Cl6 between three V priors. (c) The yin-yang kagome band structure based on TB model without considering spin orbit coupling. (d) Considering the yin-yang kagome band structure based on TB model under spin-orbit coupling.

The above research was supported by the National Natural Science Foundation of China, the Natural Science Foundation of Shandong Province and the Youth Innovation Science and Technology Program of Shandong Province.