Spin Waves and Dirac Magnons in a Honeycomb Lattice Zig-zag Antiferromagnet BaNi2(AsO4)2

Abstract

The topological properties of massive and massless fermionic quasiparticles have been intensively investigated over the past decade in topological materials without magnetism. Recently, the bosonic analogs of such quasiparticles arising from spin waves have been reported in the two-dimensional (2D) honeycomb lattice ferromagnet/antiferromagnet and the 3D antiferromagnet. Here we use time-of-flight inelastic neutron scattering to study spin waves of the S = 1 honeycomb lattice antiferromagnet BaNi2(AsO4)2, which has a zig-zag antiferromagnetic (AF) ground state identical to that of the Kitaev quantum spin liquid candidate alpha-RuCl3. We determine the magnetic exchange interactions in the zig-zag AF ordered phase, and show that spin waves in BaNi2(AsO4)2 have symmetry-protected Dirac points inside the Brillouin zone boundary. These results provide a microscopic understanding of the zig-zag AF order and associated Dirac magnons in honeycomb lattice magnets, and are also important for establishing the magnetic interactions in Kitaev quantum spin liquid candidates.

References in corpus (41)

• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• Topological Insulators
• Topological insulators and superconductors
• Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
• Anyons in an exactly solved model and beyond
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Topological Photonics
• Topological Photonics
• Classification of topological quantum matter with symmetries
• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Kitaev quantum spin liquid - concept and materialization
• Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• On the origin of magnetic anisotropy in two dimensional CrI${}_3$
• Spin waves and revised crystal structure of honeycomb iridate Na2IrO3
• Linear spin wave theory for single-Q incommensurate magnetic structures
• Low-temperature crystal and magnetic structure of $\alpha$-RuCl3
• Direct evidence of a zigzag spin chain structure in the honeycomb lattice: A neutron and x-ray diffraction investigation on single crystal $\mathrm{N}{\mathrm{a}}_2\mathrm{Ir}{\mathrm{O}}_3$
• Double-Weyl phonons in transition-metal monosilicides
• Topological spin excitations in honeycomb ferromagnet CrI${}_3$
• Classification of topological phonons in linear mechanical metamaterials
• An investigation of the quantum $J_1-J_2-J_3$ model on the honeycomb lattice
• Crystal structure and magnetism in $\alpha$-RuCl3: an ab-initio study
• Weyl magnons in breathing pyrochlore antiferromagnets
• Dirac magnons in honeycomb ferromagnets
• Kitaev interactions in the Co honeycomb antiferromagnets Na${}_3$Co${}_2$SbO${}_6$ and Na${}_2$Co${}_2$TeO${}_6$
• Zigzag antiferromagnetic ground state with anisotropic correlation lengths in the quasi-2D honeycomb lattice compound Na2Co2TeO6
• Weak-field induced nonmagnetic state in a Co-based honeycomb
• Dirac magnons in a honeycomb lattice quantum XY magnet CoTiO3
• Topological spin excitations observed in a three-dimensional antiferromagnet
• Discovery of coexisting Dirac and triply degenerate magnons in a three-dimensional antiferromagnet
• Magnetic field effect on topological spin excitations in CrI${}_3$
• Topological magnon insulator spin excitations in the two-dimensional ferromagnet CrBr${}_3$
• Field evolution of magnons in $\alpha$-RuCl${}_3$ by high-resolution polarized terahertz spectroscopy
• Spin-waves in 2D honeycomb lattice $XXZ$-type van der Waals antiferromagnet CoPS${}_3$
• Topological magnon bands in the zigzag and stripy phases of antiferromagnetic honeycomb lattice
• Orbitally induced hierarchy of exchange interactions in zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6
• Polarized-neutron investigation of magnetic ordering and spin dynamics in BaCo${}_2$(AsO${}_4$)${}_2$ frustrated honeycomb-lattice magnet
• Temperature dependence of the paramagnetic spin excitations in BaFe${}_2$As${}_2$
• Evolution of magnetic Dirac bosons in a honeycomb lattice
• Investigation of the spin-1 honeycomb antiferromagnet BaNi${}_2$V${}_2$O${}_8$ with easy plane anisotropy

Cited by in corpus (7)

• Excitations in the ordered and paramagnetic states of honeycomb magnet Na2Co2TeO6
• Topological Phases in Magnonics
• Spin wave Hamiltonian and anomalous scattering in NiPS${}_3$
• Easy-plane anisotropic-exchange magnets on a honeycomb lattice: quantum effects and dealing with them
• Understanding the magnetic interactions of the zig-zag honeycomb lattice: Application to $\alpha$-RuCl${}_3$
• Stabilization of zigzag order in NiPS${}_3$ via positive biquadratic interaction
• Spin Wave Dispersion of the van der Waals Antiferromagnet NiPS${}_3$