Dirac cone, flat band and saddle point in kagome magnet YMn6Sn6
| Autor: | Guangwei Wang, Shancai Wang, Wenhua Song, Qi Wang, Man Li, Zhengtai Liu, Zhiping Yin, Rui Lou, Zhonghao Liu, Yaobo Huang, Hechang Lei, Zhihong Yuan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Science
Dirac (software) General Physics and Astronomy 02 engineering and technology 01 natural sciences General Biochemistry Genetics and Molecular Biology symbols.namesake Saddle point 0103 physical sciences 010306 general physics Electronic band structure Physics Multidisciplinary Condensed matter physics Computer Science::Information Retrieval Fermi energy General Chemistry 021001 nanoscience & nanotechnology Dirac fermion Fractional quantum Hall effect Density of states symbols Condensed Matter::Strongly Correlated Electrons Berry connection and curvature 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) |
| ISSN: | 2041-1723 |
| Popis: | Kagome-lattices of 3d-transition metals hosting Weyl/Dirac fermions and topological flat bands exhibit non-trivial topological characters and novel quantum phases, such as the anomalous Hall effect and fractional quantum Hall effect. With consideration of spin–orbit coupling and electron correlation, several instabilities could be induced. The typical characters of the electronic structure of a kagome lattice, i.e., the saddle point, Dirac-cone, and flat band, around the Fermi energy (EF) remain elusive in magnetic kagome materials. We present the experimental observation of the complete features in ferromagnetic kagome layers of YMn6Sn6 helically coupled along the c-axis, by using angle-resolved photoemission spectroscopy and band structure calculations. We demonstrate a Dirac dispersion near EF, which is predicted by spin-polarized theoretical calculations, carries an intrinsic Berry curvature and contributes to the anomalous Hall effect in transport measurements. In addition, a flat band and a saddle point with a high density of states near EF are observed. These multi-sets of kagome features are of orbital-selective origin and could cause multi-orbital magnetism. The Dirac fermion, flat band and saddle point in the vicinity of EF open an opportunity in manipulating the topological properties in magnetic materials. |
| Databáze: | OpenAIRE |
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