Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-23536-8
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Funding
- National Natural Science Foundation of China [11774421, U1875192, 11674030, 12074041, 11774423, 11822412]
- National Key R&D Program of China [2016YFA0302300, 2016YFA0401002, 2017YFA0403401, 2018YFE0202600, 2016YFA0300504]
- Fundamental Research Funds for the Central Universities [310421113]
- Research Funds of Renmin University of China (RUC) [18XNLG14, 19XNLG17]
- CAS Pioneer Hundred Talents Program
- ME2 project from NSFC [11227902]
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The observation of a Dirac cone, flat band, and saddle point near the Fermi energy in ferromagnetic Kagome material YMn6Sn6 presents potential opportunities for manipulating topological properties and multi-orbital magnetism.
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 (E-F) 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 E-F, 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 E-F 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 E-F open an opportunity in manipulating the topological properties in magnetic materials. The typical characters of the electronic structure of magnetic kagome materials remain elusive. Here, the authors observe a Dirac cone, a flat band and a saddle point near the Fermi energy in ferromagnetic kagome material YMn6Sn6.
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