Magnetic Weyl semimetals with diamond structure realized in spinel compounds

Abstract

Diamond-structure materials have been extensively studied for decades, which form the foundation for most semiconductors and their modern day electronic devices. Here, we discover a e${}_g$-orbital ($d_{z^2}$,$d_{x^2-y^2}$ ) model within the diamond lattice (e${}_g$-diamond model) that hosts novel topological states. Specifically, the e${}_g$-diamond model yields a 3D nodal cage (3D-NC), which is characterized by a $d$-$d$ band inversion protected by two types of degenerate states (i.e., e${}_g$-orbital and diamond-sublattice degeneracies). We demonstrate materials realization of this model in the well-known spinel compounds (AB${}_2$X${}_4$), where the tetrahedron-site cations (A) form the diamond sub-lattice. An ideal half metal with one metallic spin channel formed by well-isolated and half-filled e${}_g$-diamond bands, accompanied by a large spin gap (4.36 eV) is discovered in one 4-2 spinel compound (VMg${}_2$O${}_4$), which becomes a magnetic Weyl semimetal when spin-orbit coupling effect is further considered. Our discovery greatly enriches the physics of diamond structure and spinel compounds, opening a door to their application in spintronics.

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Cited by in corpus (12)

• Field-tunable toroidal moment and anomalous Hall effect in noncollinear antiferromagnetic Weyl semimetal Co1/3TaS2
• Ideal fully spin-polarized type-II nodal line state in half-metals X2YZ4 (X=K, Cs, Rb, Y=Cr, Cu, Z=Cl, F)
• Giant Anomalous Hall Effect due to Double-Degenerate Quasi Flat Bands
• Fully spin-polarized nodal chain state in half metal LiV${}_2$O${}_4$
• Fully spin-polarized double-Weyl fermions with type-III dispersion in quasi-one dimensional materials X2RhF6 (X=K, Rb, Cs)
• Weyl Nodal Line-Surface Half-metal in CaFeO${}_3$
• Gigantic tunneling magnetoresistance in magnetic Weyl semimetal tunnel junctions
• Ferromagnetic phase of spinel compound MgV${}_2$O${}_4$ and its spintronics properties
• Broken symmetry and competing orders in Weyl semimetal interfaces
• Room temperature spin-orbit torque efficiency in sputtered low-temperature superconductor delta-TaN
• Dipolar optical plasmon in thin-film Weyl semimetals
• Ab initio study on the possible magnetic topological semimetallic state in MnMg${}_2$O${}_4$}