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| Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals RAlSi (R=La, Ce, Pr, Nd, Sm) | |
| 2024-05-15 | |
| 发表期刊 | PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year]) |
| ISSN | 2469-9950 |
| EISSN | 2469-9969 |
| 卷号 | 109期号:19 |
| 发表状态 | 已发表 |
| DOI | 10.1103/PhysRevB.109.195130 |
| 摘要 | Weyl semimetals with magnetic ordering provide a promising platform for the investigation of rare topological effects such as the anomalous Hall effect, resulting from the interplay of nontrivial bands with various spin configurations. The materials RAlSi, where R represents a rare-earth element, are prominent representatives of Weyl semimetals, where the Weyl states are induced by space inversion symmetry breaking, and in addition, for several rare-earth elements R, enhanced by time-reversal symmetry breaking through the formation of a magnetic order at low temperature. We report optical signatures of Weyl fermions in the magnetic compounds CeAlSi, PrAlSi, NdAlSi, and SmAlSi as well as the nonmagnetic family member LaAlSi by broad-frequency infrared spectroscopy at room temperature, i.e., in the paramagnetic phase. A similar profile of the optical conductivity spectrum and a metallic character are observed for all compounds, with LaAlSi showing the strongest free charge-carrier contribution. Furthermore, the linear-in-frequency behavior of the optical conductivity of all investigated compounds indicates the presence of Weyl nodes in close proximity to the Fermi energy, resulting from inversion symmetry breaking in noncentrosymmetric structures. According to the characteristics of these linear slopes, the RAlSi compounds are expected to host mainly type-II Weyl states with overtilted Weyl cones. The results are compared to the optical response of the closely related RAlGe materials, which are considered as potential hybridization-driven Weyl-Kondo systems. © 2024 American Physical Society. |
| 关键词 | Heterojunctions Infrared spectroscopy Lanthanum compounds Rare earth elements Silicon compounds Temperature Anomalous hall effects Inversion symmetry Lows-temperatures Magnetic orders Optical signatures Spin configurations Symmetry breakings Time reversal symmetries Topological effects Type II |
| URL | 查看原文 |
| 收录类别 | EI ; SCI |
| 语种 | 英语 |
| 资助项目 | Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)[TRR 360-492547816] ; National Natural Science Foundation of China["52272265","U1932217","11974246","12004252"] ; National Key R & D Program of China[2018YFA0704300] |
| WOS研究方向 | Materials Science ; Physics |
| WOS类目 | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
| WOS记录号 | WOS:001237461200001 |
| 出版者 | American Physical Society |
| EI入藏号 | 20242016088800 |
| EI主题词 | Rare earths |
| EI分类号 | 547.2 Rare Earth Metals ; 641.1 Thermodynamics ; 714.2 Semiconductor Devices and Integrated Circuits ; 804.2 Inorganic Compounds |
| 原始文献类型 | Journal article (JA) |
| 引用统计 | 正在获取...
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| 文献类型 | 期刊论文 |
| 条目标识符 | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/375717 |
| 专题 | 物质科学与技术学院 物质科学与技术学院_PI研究组_齐彦鹏组 物质科学与技术学院_博士生 |
| 作者单位 | 1.Experimental Physics II, Institute of Physics, University of Augsburg, Augsburg; 86159, Germany; 2.School of Physical Science and Technology, ShanghaiTech University, Shanghai; 201210, China; 3.ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai; 201210, China; 4.Shanghai Key Laboratory of High-resolution Electron Microscopy, Shanghai Tech Laboratory for Topological Physics, Shanghai Tech University, Shanghai; 201210, China |
| 推荐引用方式 GB/T 7714 | Kunze, J.,Köpf, M.,Cao, Weizheng,et al. Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals RAlSi (R=La, Ce, Pr, Nd, Sm)[J]. PHYSICAL REVIEW B,2024,109(19). |
| APA | Kunze, J.,Köpf, M.,Cao, Weizheng,Qi, Yanpeng,&Kuntscher, C.A..(2024).Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals RAlSi (R=La, Ce, Pr, Nd, Sm).PHYSICAL REVIEW B,109(19). |
| MLA | Kunze, J.,et al."Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals RAlSi (R=La, Ce, Pr, Nd, Sm)".PHYSICAL REVIEW B 109.19(2024). |
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