Dynamical properties of the honeycomb-lattice Iridates $\mathrm{N}{\mathrm{a}}_2\mathrm{Ir}{\mathrm{O}}_3$

Abstract

We investigate the dynamical properties of $\mathrm{N}{\mathrm{a}}_2\mathrm{Ir}{\mathrm{O}}_3$. For five effective models proposed for $\mathrm{N}{\mathrm{a}}_2\mathrm{Ir}{\mathrm{O}}_3$, we numerically calculate dynamical structure factors (DSFs) with an exact diagonalization method. An effective model obtained from $ab$ $initio$ calculations explains inelastic neutron scattering experiments adequately. We further calculate excitation modes based on linearized spin-wave theory. The spin-wave excitation of the effective models obtained by $ab$ $initio$ calculations disagrees with the low-lying excitation of DSFs. We attribute this discrepancy to the location of $\mathrm{N}{\mathrm{a}}_2\mathrm{Ir}{\mathrm{O}}_3$ in a parameter space close to the phase boundary with the Kitaev spin-liquid phase.

7 pages, 4 figures

References in corpus (12)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• $\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice
• On the Origin of Zigzag Magnetic Order in Iridium Oxide Na2IrO3
• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Magnetic order in $\alpha$-RuCl${}_3$: a honeycomb lattice quantum magnet with strong spin-orbit coupling
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Successive magnetic phase transitions in $\mathbf{\alpha }$-RuCl${}_3$: XY-like frustrated magnet on the honeycomb lattice
• Thermal fractionalization of quantum spins in a Kitaev model: $T$-linear specific heat and coherent transport of Majorana fermions
• Na2IrO3 as a spin-orbit-assisted antiferromagnetic insulator with a 340 meV gap
• Anisotropic Ru3+ 4d5 magnetism in the alpha-RuCl3 honeycomb system: susceptibility, specific heat and Zero field NMR
• Vaporization of Kitaev spin liquids
• Importance of anisotropic exchange interactions in honeycomb iridates. Minimal model for zigzag antiferromagnetic order in Na${}_2$IrO${}_3$

Cited by in corpus (16)

• Dynamics of the Kitaev-Heisenberg Model
• Clues and criteria for designing Kitaev spin liquid revealed by thermal and spin excitations of honeycomb iridates Na${}_2$IrO${}_3$
• Honeycomb Layered Oxides: Structure, Energy Storage, Transport, Topology and Relevant Insights
• Ground-state and thermodynamic properties of an $S=1$ Kitaev model
• Majorana-mediated spin transport without spin polarization in Kitaev quantum spin liquids
• Interlayer Coupling Effect on a Bilayer Kitaev Model
• Nonequilibrium Majorana Dynamics by Quenching a Magnetic Field in Kitaev Spin Liquids
• Spin-Liquid--to--Spin-Liquid Transition in Kitaev Magnets Driven by Fractionalization
• Majorana correlations in the Kitaev model with ordered-flux structures
• Role of the spin-orbit coupling in the Kugel-Khomskii model on the honeycomb lattice
• Residual Entropy and Spin Fractionalizations in the Mixed-Spin Kitaev Model
• Spin transport in the Quantum Spin Liquid State in the $S=1$ Kitaev model: role of the fractionalized quasiparticles
• First-principles Study on the Magnetic Interactions in Honeycomb Na2IrO3
• Projective-symmetry-group analysis of inelastic light scattering in Kitaev spin balls
• Majorana Gap Formation in the Anisotropic Kitaev Model with Ordered Flux Configuration
• Topological quantum phase transitions of anisotropic AFM Kitaev model driven by magnetic field