Genuine Dirac Half-Metals in Two-Dimensions.

ABSTRACT: When spin-orbit coupling (SOC) is absent, all proposed half-metals with twofold degenerate nodal points at the K (or K') point in 2D materials are classified as "Dirac half-metals" owing to the way graphene is utilized in the earliest studies. Actually, each band crossing point at the K or K' point is described by a 2D Weyl Hamiltonian with definite chirality; hence, it should be a Weyl point. To the best of its knowledge, there have not yet been any reports of a genuine (i.e., fourfold degenerate) 2D Dirac point half-metal. In this work, using first-principles calculations, it proposes for the first time that the 2D d⁰ -type ferromagnet Mg₄ N₄ is a genuine 2D Dirac half-metal candidate with a fourfold degenerate Dirac point at the S high-symmetry point, in

SUBMITTER: Gong J 

PROVIDER: S-EPMC10853703 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature