Dirac cone, flat band and saddle point in kagome magnet YMn₆Sn₆.

ABSTRACT: 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. W

SUBMITTER: Li M 

PROVIDER: S-EPMC8149840 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature