文献类型：期刊文献

英文题名：Two-dimensional half Chern-Weyl semimetal with multiple screw axes

作者：Xu, Wei[1];Yi, Jiawei[1];Huan, Hao[2,3,4];Zhao, Bao[2,3,4,5];Xue, Yang[1];Yang, Zhongqin[2,3,4]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China;[3]Fudan Univ, Key Lab Computat Phys Sci MOE, Shanghai 200433, Peoples R China;[4]Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China;[5]Liaocheng Univ, Sch Phys Sci & Informat Technol, Shandong Key Lab Opt Commun Sci & Technol, Liaocheng 252059, Peoples R China

年份：2022

卷号：106

期号：20

外文期刊名：PHYSICAL REVIEW B

收录：;EI(收录号：20224713142407);WOS:【SCI-EXPANDED(收录号:WOS:000901458300003)】；

基金：ACKNOWLEDGMENTS This work was supported by National Natural Science Foundation of China under Grants No. 11904101, No. 11604134, No. 11874117, and No. 12174059 and the Nat-ural Science Foundation of Shanghai under Grant No. 21ZR1408200.

语种：英文

外文关键词：Magnetism - Magnetocrystalline anisotropy - Monolayers - Screws - Titanium compounds

摘要：Half-topological states of matter and two-dimensional (2D) magnetism have gained much attention recently. In this paper, we propose a special topological semimetal phase called a 2D half Chern-Weyl semimetal (HCWS), which is a 2D magnetic Weyl semimetal bound to the half Chern insulator (fully spin-polarized Chern insulator) phase by symmetry, and the two phases can be converted to each other by manipulating the magnetization direction. We provide the symmetry conditions to realize this state in 2D systems with multiple screw axes. Tight-binding models with multiple basis and a predicted 2D material, monolayer TiTe, are shown as the concrete examples for HCWSs. The TiTe monolayer was shown to have a high ferromagnetic Curie temperature (approximate to 966 K) as well as a Coulomb correlation-enhanced spin-orbit coupling (SOC), and further demonstrates the effect of correlation-enhanced SOC on magnetocrystalline anisotropy energy and energy gap opening. Our work reveals a state with switchable and spin-resolved half-body charge currents as well as half-boundary charge currents, and will provide a platform for novel and high-performance topological spintronics devices.