Weyl Fermion with various chiralities in a f-electron ferromagnetic system: PrB4

Abstract

Rare-earth tetraborides ($R$B${}_4$) have attracted a lot of recent attention due to their intriguing electronic, magnetic, and topological properties. We have theoretically investigated topological properties of PrB${}_4$, which is unique among $R$B${}_4$ family due to its ferromagnetic ground state. We have discovered that PrB${}_4$ is an intrinsic magnetic Weyl system possessing multiple topological band crossings with various chiral charges. Density-functional-theory band calculations combined with tight-binding band analysis reveal large Fermi-arc surface states, which are characteristic fingerprints of Weyl fermions. Anomalous Hall conductivity is estimated to be very large, ranging from 500 to 1000 ($\Omega \cdot$cm)${}^{-1}$ near the Fermi level, which also demonstrates the topological Weyl character of ferromagnetic PrB${}_4$. These findings suggest that PrB${}_4$, being a potential candidate of magnetic Weyl system, would be a promising rare-earth topological system for applications to next-generation spintronic and photonic devices.

arXiv comment7 pages, 6 figures

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Cited by in corpus (1)

• Chiral symmetry and magnetism in a 3D Kagome lattice: RPt${}_2$B (R = La and Nd) prototype crystals