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Genuine Dirac Half‐Metals in Two‐Dimensions.
- Source :
-
Advanced Science . 2/9/2024, Vol. 11 Issue 6, p1-7. 7p. - Publication Year :
- 2024
-
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 forthefirsttime that the 2D d0‐type ferromagnet Mg4N4 is a genuine 2D Dirac half‐metal candidate with a fourfold degenerate Dirac point at the S high‐symmetry point, intrinsic magnetism, a high Curie temperature, 100% spin polarization, topology robust under the SOC and uniaxial and biaxial strains, and spin‐polarized edge states. This work can serve as a starting point for future predictions of intrinsically magnetic materials with genuine 2D Dirac points, which will aid the frontier of topo‐spintronics research in 2D systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21983844
- Volume :
- 11
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Advanced Science
- Publication Type :
- Academic Journal
- Accession number :
- 175365432
- Full Text :
- https://doi.org/10.1002/advs.202307297