Mechanical-electro-magnetic coupling in strained bilayer CrI3

作     者：ZHANG ShuQing ZOU XiaoLong CHENG HuiMing ZHANG ShuQing;ZOU XiaoLong;CHENG HuiMing

作者机构：Shenzhen Geim Graphene Center(SGC)Tsinghua-Berkeley Shenzhen Institute(TBSI)&Tsinghua Shenzhen International Graduate School(TSIGS)Tsinghua UniversityShenzhen 518055China Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2020年第63卷第7期

页      面：1265-1271页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2017YFB0701600) the National Natural Science Foundation of China (Grant Nos. 11974197 51920105002) Shenzhen Basic Research Projects (Grant No. JCYJ20170407155608882) Guangdong Innovative and Entrepreneurial Research Team Program(Grant No. 2017ZT07C341) the Bureau of Industry and Information Technology of Shenzhen for the 2017 Graphene Manufacturing Innovation Center Project (Grant No. 201901171523) the China Postdoctoral Science Foundation (Grant No. 2018M631458) 

主　　题：bilayer Crl3 magnetic coupling strain band gap orbital composition 

摘      要：The discovery of intrinsic 2D ferromagnets provides exciting possibilities for spintronics applications. A particularly attractive example is CrI3, whose monolayer is ferromagnetic while bilayer shows antiferromagnetic coupling. Because of weak interlayer coupling, the magnetism of bilayer CrI3 can be easily modulated by external perturbations, such as gating or pressure. Here, we constructed a magnetic phase diagram of bilayer CrI3 under arbitrary biaxial strain(within ±4%) from compression to stretch,and found that compressive strain can effectively convert the antiferromagnetic coupling of bilayer CrI3 to *** analyses on electronic structure were then performed to unravel the underlying mechanism of the magnetic phase transition. It was shown that both band gap and orbital composition at conduction band minimum play important roles in determining magnetic ground states of strained bilayer CrI3. These results strengthen our understanding of the interlayer magnetism of 2D magnets and provide a feasible way to modulate the magnetism in 2D layered materials.