Emergence of Nontrivial Low-Energy Dirac Fermions in Antiferromagnetic EuCd2As2
文献类型：期刊论文
| 作者 | Ma, JZ; Wang, H; Nie, SM; Yi, CJ; Xu, YF; Li, H; Jandke, J; Wulfhekel, W; Huang, YB; West, D |
| 刊名 | ADVANCED MATERIALS
 |
| 出版日期 | 2020 |
| 卷号 | 32期号:14页码:- |
| ISSN号 | 0935-9648 |
| 关键词 | SEMIMETAL DISCOVERY |
| DOI | 10.1002/adma.201907565 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Parity-time symmetry plays an essential role for the formation of Dirac states in Dirac semimetals. So far, all of the experimentally identified topologically nontrivial Dirac semimetals (DSMs) possess both parity and time reversal symmetry. The realization of magnetic topological DSMs remains a major issue in topological material research. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, it is ascertained that band inversion induces a topologically nontrivial ground state in EuCd2As2. As a result, ideal magnetic Dirac fermions with simplest double cone structure near the Fermi level emerge in the antiferromagnetic (AFM) phase. The magnetic order breaks time reversal symmetry, but preserves inversion symmetry. The double degeneracy of the Dirac bands is protected by a combination of inversion, time-reversal, and an additional translation operation. Moreover, the calculations show that a deviation of the magnetic moments from the c-axis leads to the breaking of C3 rotation symmetry, and thus, a small bandgap opens at the Dirac point in the bulk. In this case, the system hosts a novel state containing three different types of topological insulator: axion insulator, AFM topological crystalline insulator (TCI), and higher order topological insulator. The results provide an enlarged platform for the quest of topological Dirac fermions in a magnetic system. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32846]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China 2.Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland 3.Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland 4.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA 5.Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA 6.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 7.Univ Chinese Acad Sci, Sch Phys, Beijing 100190, Peoples R China 8.Karlsruhe Inst Technol, Phys Inst, D-76131 Karlsruhe, Germany 9.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China 10.Univ Sherbrooke, Inst Quant, 2500 Blvd Univ, Sherbrooke, PQ J1K 2R1, Canada |
| 推荐引用方式 GB/T 7714 | Ma, JZ,Wang, H,Nie, SM,et al. Emergence of Nontrivial Low-Energy Dirac Fermions in Antiferromagnetic EuCd2As2[J]. ADVANCED MATERIALS,2020,32(14):-. |
| APA | Ma, JZ.,Wang, H.,Nie, SM.,Yi, CJ.,Xu, YF.,...&Ding, H.(2020).Emergence of Nontrivial Low-Energy Dirac Fermions in Antiferromagnetic EuCd2As2.ADVANCED MATERIALS,32(14),-. |
| MLA | Ma, JZ,et al."Emergence of Nontrivial Low-Energy Dirac Fermions in Antiferromagnetic EuCd2As2".ADVANCED MATERIALS 32.14(2020):-. |
入库方式： OAI收割
来源：上海应用物理研究所
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