物理学进展2021，Vol.41Issue(3)：136-156,21.DOI:10.13725/j.cnki.pip.2021.03.002
反铁磁半金属EuCd2Pn2(Pn=As,Sb)中磁交换诱导的外尔态
Magnetic exchange induced Weyl states in the antiferromagnetic semimetals EuCd2Pn2 (Pn = As, Sb)
摘要
Abstract
Three-dimensional (3D) topological semimetals (TSMs) have arrested special at-tentions as 3D analogues to graphene. The TSMs, for example, the Dirac and Weyl semimetals, show an array of intriguing physical properties arising from the electronic band structure topol-ogy, which have therefore been under immense investigations. Most of the known TSMs are nonmagnetic, whereas the magnetic TSMs are very few and remain less investigated. The in-terplay between magnetism and nontrivial topological states can result in exceptional physical properties, such as anomalous or even quantum anomalous Hall effect. In some TSMs with pe-culiar magnetic structures, the magnetic exchange could be tuned by application of an external magneticfield, which consequently can affect the topological properties. We review herein the family of antiferromagnetic semimetals EuCd2Pn2 (Pn = As, Sb) which exhibit topological phase transitions induced by an external magnetic field through tuning the spin structures and hence the structure symmetries that are protecting the topological states. Besides, we will also briefly review several other related materials including the GdPtBi and MnBi2Te4. The herein discussed magnetism induced topological phase transition provides potential use in novel topological devices since the topological states could be conveniently controlled by external magnetic field. Furthermore, it also contributes important clues toward understand-ing the intimate relation between magnetism and topological states, which are instructive for designing new magnetic topological phases. At the end of this review, we also give a short perspective for the development of the magnetic TSMs.关键词
拓扑半金属/磁性拓扑相/反铁磁拓扑绝缘体/外尔半金属/拓扑相变Key words
Topological semimetals/Magnetic topological phases/Antiferromagnetic topo-logical insulator/Weyl semimetals/Topological phase transition分类
数理科学引用本文复制引用
苏豪,陈雷明,夏威,郭艳峰..反铁磁半金属EuCd2Pn2(Pn=As,Sb)中磁交换诱导的外尔态[J].物理学进展,2021,41(3):136-156,21.基金项目
The authors acknowledge the support by the strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA18000000),and the Key Scientific Research Projects of Higher Insti-tutions in Henan Province(19A140018).Y.F.G.ac-knowledges the starting grant of ShanghaiTech Univer-sity and the Program for Professor of Special Appoint-ment(Shanghai Eastern Scholar).The authors thank the support from Analytical Instrumentation Center(#SPST-AIC10112914),SPST,ShanghaiTech Univer-sity. （Grant No.XDA18000000）
