Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn  

作　　者：任小浪 张昌文 Xiao-Lang Ren;Chang-Wen Zhang(School of Physics and Technology,Institute of Spintronics,University of Jinan,Jinan 250022,China)

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

出　　处：《Chinese Physics B》2024年第6期504-509,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 52173283);the Taishan Scholar Program of Shandong Province,China (Grant No. ts20190939);the Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043)。

摘　　要：Quantum anomalous Hall(QAH) insulators have excellent properties driven by fancy topological physics, but their practical application is greatly hindered by the observed temperature of liquid nitrogen, and the QAH insulator with high Chern number is conducive to spintronic devices with lower energy consumption. Here, we find that monolayer Fe SIn is a good candidate for realizing the QAH phase;it exhibits a high magnetic transition temperature of 221 K and tunable C = ±2 with respect to magnetization orientation in the y–z plane. After the application of biaxial strain, the magnetic axis shifts from the x–y plane to the z direction, and the effect of the high C and ferromagnetic ground state on the stress is robust. Also, the effect of correlation U on C has been examined. These properties are rooted in the large size of the Fe atom that contributes to ferromagnetic kinetic exchange with neighboring Fe atoms. These findings demonstrate monolayer Fe SIn to be a major template for probing novel QAH devices at higher temperatures.

关 键 词：high Chern number Weyl semimetals quantum anomalous Hall insulator magnetic transition temperature 

分 类 号：O469[理学—凝聚态物理]