Hidden Quasiparticles and Incoherent Photoemission Spectra in Na2IrO3

Abstract

We study two Heisenberg-Kitaev t-J-like models on a honeycomb lattice, focusing on the zigzag magnetic phase of Na${}_2$IrO${}_3$, and investigate hole motion by exact diagonalization and variational methods. The spectral functions are quite distinct from those of cuprates and are dominated by large incoherent spectral weight at high energy, almost independent of the microscopic parameters --- a universal and generic feature for zigzag magnetic correlations. We explain why quasiparticles at low energy are strongly suppressed in the photoemission spectra and determine an analog of a pseudogap. We point out that the qualitative features of the predominantly incoherent spectra obtained within the two different models for the zigzag phase are similar, and they have remarkable similarity to recently reported angular resolved photoemission spectra for Na${}_2$IrO${}_3$.

5 pages, 5 figures, and appendix

References in corpus (18)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• On the Origin of Zigzag Magnetic Order in Iridium Oxide Na2IrO3
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Exact results for spin dynamics and fractionization in the Kitaev Model
• Long range magnetic ordering in Na${}_2$IrO${}_3$
• Crystal field splitting and correlation effect on the electronic structure of A2IrO3
• Na2IrO3 as a spin-orbit-assisted antiferromagnetic insulator with a 340 meV gap
• Na2IrO3 as a molecular orbital crystal
• Spin-orbital quantum liquid on the honeycomb lattice
• Quantum Phase Transition in Heisenberg-Kitaev Model
• Fingerprints of spin-orbital entanglement in transition metal oxides
• Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy
• Numerical approach to low-doping regime of the t-J model
• Ferro-Orbitally Ordered Stripes in Systems with Alternating Orbital Order
• Magnetic properties of nanoscale compass-Heisenberg planar clusters
• Spin polaron in the J1-J2 Heisenberg model
• Fractional charges and spin-charge separation in one-dimensional Wigner lattices
• The role of the lattice structure in determining the magnon-mediated interactions between charge carriers doped into a magnetically ordered background

Cited by in corpus (26)

• Kitaev-Heisenberg models for iridates on the triangular, hyperkagome, kagome, fcc, and pyrochlore lattices
• Three dimensional quantum spin liquids in models of harmonic-honeycomb iridates and phase diagram in an infinite-D approximation
• J${}_{eff}$ description of the honeycomb Mott insulator $\alpha$-RuCl${}_3$
• Spiral order in the honeycomb iridate Li2IrO3
• Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects
• Kitaev-like honeycomb magnets: Global phase behavior and emergent effective models
• Structural, Magnetic, and Electrical Properties of Li2Ir1-xRuxO3
• Hole propagation in the Kitaev-Heisenberg model: From quasiparticles in quantum Neel states to non-Fermi liquid in the Kitaev phase
• Quantum entanglement in the one-dimensional spin-orbital SU(2)$\otimes XXZ$ model
• Frustration and Entanglement in Compass and Spin-Orbital Models
• Effect of disorder on the dimer transition of the honeycomb-lattice compound Li${}_2$RuO${}_3$
• Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na${}_2$IrO${}_3$
• Spin, orbital and topological order in models of strongly correlated electrons
• Thermal conductivity of local moment models with strong spin-orbit coupling
• Interplay between Hund's coupling and spin-orbit interaction on elementary excitations in Sr2IrO4
• Green's function variational approach to orbital polarons in KCuF3
• The Insulating Nature of Na2IrO3: Mott-type or Slater-type?
• Multiband $d-p$ model and self-doping in the electronic structure of Ba${}_2$IrO${}_4$
• Simulating spin systems with Majorana networks
• Dynamics of a single hole in the Heisenberg-Kitaev model: a self-consistent Born approximation study
• Pairing tendencies in the doped Kitaev-Heisenberg model
• Spectrum of the hole excitation in spin-orbit Mott insulator Na${}_2$IrO${}_3$
• The Green function variational approximation: Significance of physical constraints
• One-dimensional frustrated plaquette compass model: Nematic phase and spontaneous multimerization
• Quantum phase transitions in the Kitaev--Heisenberg model on a single hexagon
• Magnetic polarons due to spin-length fluctuations in ${\mathbf{d}}^4$ spin-orbit Mott systems