First-principles prediction of quantum anomalous Hall effect in two-dimensional Co2Te lattice  

作　　者：刘元硕 孙浩 胡春生 仵允京 张昌文 Yuan-Shuo Liu;Hao Sun;Chun-Sheng Hu;Yun-Jing Wu;Chang-Wen Zhang(School of Physics and Technology,University of Jinan,Jinan 250022,China)

机构地区：[1]School of Physics and Technology,University of Jinan,Jinan 250022,China

出　　处：《Chinese Physics B》2023年第2期411-416,共6页中国物理B（英文版）

基　　金：supported by the Taishan Scholar Program of Shandong Province, China (Grant No. ts20190939);the Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043);the National Natural Science Foundation of China (Grant No. 52173238)。

摘　　要：The quantum anomalous Hall effect(QAHE) has special quantum properties that are ideal for possible future spintronic devices. However, the experimental realization is rather challenging due to its low Curie temperature and small non-trivial bandgap in two-dimensional(2D) materials. In this paper, we demonstrate through first-principles calculations that monolayer Co2Te material is a promising 2D candidate to realize QAHE in practice. Excitingly, through Monte Carlo simulations, it is found that the Curie temperature of single-layer Co2Te can reach 573 K. The band crossing at the Fermi level in monolayer Co2Te is opened when spin–orbit coupling is considered, which leads to QAHE with a sizable bandgap of Eg= 96 me V, characterized by the non-zero Chern number(C = 1) and a chiral edge state. Therefore, our findings not only enrich the study of quantum anomalous Hall effect, but also broaden the horizons of the spintronics and topological nanoelectronics applications.

关 键 词：quantum anomalous Hall effect spin-polarizationm Chern insulator first-principles calculations 

分 类 号：O469[理学—凝聚态物理]