Topological Dirac Nodal-net Fermions in AlB-type TiB and ZrB
arXiv:1705.00511 · doi:10.1103/PhysRevMaterials.2.014202
Abstract
Based on first-principles calculations and effective model analysis, a Dirac nodal-net semimetal state is recognized in AlB-type TiB and ZrB when spin-orbit coupling (SOC) is ignored. Taking TiB as an example, there are several topological excitations in this nodal-net structure including triple point, nexus, and nodal link, which are protected by coexistence of spatial-inversion symmetry and time reversal symmetry. This nodal-net state is remarkably different from that of IrF, which requires sublattice chiral symmetry. In addition, linearly and quadratically dispersed two-dimensional surface Dirac points are identified as having emerged on the B-terminated and Ti-terminated (001) surfaces of TiB respectively, which are analogous to those of monolayer and bilayer graphene.
arXiv comment12 pages, 13 figures, Corrected some citations
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