Topological Dirac nodal loops in nonsymmorphic hydrogenated monolayer boron
Nguyen Thanh Cuong, Ikuma Tateishi, Mathis Cameau, Masahito Niibe, Naoto Umezawa, Ben Slater, Kunio Yubuta, Takahiro Kondo, Masao Ogata, Susumu Okada, Iwao Matsuda
Abstract
The existence of a topological Dirac nodal loop is predicted for hydrogenated monolayer boron sheets with a nonsymmorphic symmetry. The three-center two-electron bonds in boron compounds restrict the electronic system to be insulating or semimetallic with a Dirac nodal loop. Two types of electronic structures are distinguished by the ${\mathbb{Z}}_{2}$ topological index and confirmed by first-principles total-energy calculations. The topological taxonomy, developed in this research, can be applied to other two-dimensional materials and to seek novel Dirac fermions.
Topics & Concepts
MonolayerDirac (video compression format)NODALDirac fermionLoop (graph theory)Topology (electrical circuits)PhysicsSymmetry (geometry)BoronCondensed matter physicsFermionMaterials scienceQuantum mechanicsNanotechnologyMathematicsBiologyGeometryCombinatoricsAnatomyNuclear physicsNeutrinoTopological Materials and PhenomenaBoron and Carbon Nanomaterials ResearchGraphene research and applications