Observation of three-component fermions in the topological semimetal molybdenum phosphide
文献类型：期刊论文
| 作者 | Lv, BQ; Feng, ZL; Xu, QN; Gao, X; Ma, JZ; Kong, LY; Richard, P; Huang, YB; Strocov, VN; Fang, C |
| 刊名 | NATURE
 |
| 出版日期 | 2017 |
| 卷号 | 546期号:7660页码:627-+ |
| 关键词 | Majorana Fermions Dirac Semimetal Taas Superconductor Discovery Surface Arcs |
| ISSN号 | 0028-0836 |
| DOI | 10.1038/nature22390 |
| 文献子类 | 期刊论文 |
| 英文摘要 | In quantum field theory, Lorentz invariance leads to three types of fermion-Dirac, Weyl and Majorana. Although the existence of Weyl and Majorana fermions as elementary particles in high-energy physics is debated, all three types of fermion have been proposed to exist as low-energy, long-wavelength quasiparticle excitations in condensed-matter systems(1-12). The existence of Dirac and Weyl fermions in condensed-matter systems has been confirmed experimentally(13-18), and that of Majorana fermions is supported by various experiments(19,20). However, in condensed-matter systems, fermions in crystals are constrained by the symmetries of the 230 crystal space groups rather than by Lorentz invariance, giving rise to the possibility of finding other types of fermionic excitation that have no counterparts in high-energy physics(21-29). Here we use angle-resolved photoemission spectroscopy to demonstrate the existence of a triply degenerate point in the electronic structure of crystalline molybdenum phosphide. Quasiparticle excitations near a triply degenerate point are three-component fermions, beyond the conventional Dirac-Weyl-Majorana classification, which attributes Dirac and Weyl fermions to four-and two-fold degenerate points, respectively. We also observe pairs of Weyl points in the bulk electronic structure of the crystal that coexist with the three-component fermions. This material thus represents a platform for studying the interplay between different types of fermions. Our experimental discovery opens up a way of exploring the new physics of unconventional fermions in condensed-matter systems. |
| WOS关键词 | MAJORANA FERMIONS ; DIRAC SEMIMETAL ; TAAS ; SUPERCONDUCTOR ; DISCOVERY ; SURFACE ; ARCS |
| 语种 | 英语 |
| WOS记录号 | WOS:000404332000042 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/28758]  |
| 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 |
| 推荐引用方式 GB/T 7714 | Lv, BQ,Feng, ZL,Xu, QN,et al. Observation of three-component fermions in the topological semimetal molybdenum phosphide[J]. NATURE,2017,546(7660):627-+. |
| APA | Lv, BQ.,Feng, ZL.,Xu, QN.,Gao, X.,Ma, JZ.,...&Ding, H.(2017).Observation of three-component fermions in the topological semimetal molybdenum phosphide.NATURE,546(7660),627-+. |
| MLA | Lv, BQ,et al."Observation of three-component fermions in the topological semimetal molybdenum phosphide".NATURE 546.7660(2017):627-+. |
入库方式： OAI收割
来源：上海应用物理研究所
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