$\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice

Abstract

We examine the role of spin-orbit coupling in the electronic structure of $\alpha$-RuCl3, in which Ru ions in 4d5 configuration form a honeycomb lattice. The measured optical spectra exhibit a clear optical gap and excitations within the t2g orbitals. The spectra can be described very well with first-principles electronic structure calculations obtained by taking into account both spin orbit coupling and electron correlations. Furthermore, our X-ray absorption spectroscopy measurements at the Ru L-edges exhibit distinct spectral features associated with the presence of substantial spin- orbit coupling, as well as an anomalously large branching ratio. We propose that $\alpha$-RuCl3 is a spin-orbit assisted Mott insulator, and the bond-dependent Kitaev interaction may be relevant for this compound.

5 pages, 4 figures

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Cited by in corpus (246)

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• Successive magnetic phase transitions in $\mathbf{\alpha }$-RuCl${}_3$: XY-like frustrated magnet on the honeycomb lattice
• Kitaev magnetism in honeycomb RuCl3 with intermediate spin-orbit coupling
• Experimental identification of quantum spin liquids
• Spin-wave excitations evidencing the Kitaev interaction in single crystalline $\alpha$-RuCl${}_3$
• Kitaev-Heisenberg Hamiltonian for High-Spin $d^7$ Mott Insulators
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• Hidden symmetries of the extended Kitaev-Heisenberg model: Implications for honeycomb lattice iridates A2IrO3
• Magnetic Excitations and Continuum of a Field-Induced Quantum Spin Liquid in $\alpha$-RuCl${}_3$
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• Honeycomb-lattice Heisenberg-Kitaev model in a magnetic field: Spin canting, metamagnetism, and vortex crystals
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• Raman spectroscopic signature of fractionalized excitations in the harmonic-honeycomb iridates $\beta$- and $\gamma$-Li${}_2$IrO${}_3$
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• Thermodynamic Evidence of Proximity to a Kitaev Spin-Liquid in Ag${}_3$LiIr${}_2$O${}_6$
• Electronic Structure of the Kitaev Material $\alpha$-${\text{RuCl}}_3$ Probed by Photoemission and Inverse Photoemission Spectroscopies
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• Thermodynamic and Transport Properties in Disordered Kitaev Models
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• Observation of spin-orbit excitations and Hund's multiplets in Ca${}_2$RuO${}_4$
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• Nonlinear response of the Kitaev honeycomb lattice model in a weak magnetic field
• Persistent spin dynamics in magnetically ordered honeycomb cobalt oxides
• Spin excitation continuum to topological magnon crossover and thermal Hall conductivity in Kitaev magnets
• Gauge field entanglement of Kitaev's honeycomb model
• Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization
• Two-step growth of high-quality single crystals of the Kitaev magnet $\alpha$-RuCl${}_3$
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• Neutron spectroscopy evidence for a possible magnetic-field-induced gapless quantum-spin-liquid phase in a Kitaev material $\alpha$-RuCl${}_3$
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• Quantum phase transition between spin liquid and spin nematics in spin-1 Kitaev honeycomb model
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• Bound states of fractionalized excitations in a modulated Kitaev spin liquid
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• Emergent SU(2)${}_1$ conformal symmetry in the spin-1/2 Kitaev-Gamma chain with a Dzyaloshinskii-Moriya interaction
• Nature of Topological Phase Transition of Kitaev Quantum Spin Liquids
• Theory of quasiparticle interference in Kitaev quantum spin liquids
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• Multipolar spin liquid in an exactly solvable model for $j_{\mathrm{eff}}=\frac{3}{2}$ moments
• High-field quantum spin liquid transitions and angle-field phase diagram of Kitaev magnet $\alpha$-RuCl${}_3$
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• A Layered Spin 1/2 polymorph of titanium triiodide
• Orbitally-selective Breakdown of the Fermi Liquid and Simultaneous Enhancement of Metallic and Insulating States in Correlated Multi-band Systems with Spin-orbit Coupling
• Emergent Hyper-Magic Manifold in Twisted Kitaev Bilayers
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• Exact Ground States and Phase Diagram of the Quantum Compass Model under an in-plane Field
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• Nonreciprocal heat transport in the Kitaev chiral spin liquid
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• Static and dynamical magnetic properties of the extended Kitaev-Heisenberg model with spin vacancies
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• Metal-insulator transitions in pyrochlore oxides
• Quantum criticality and emergent orders in the spin-1 bilinear-biquadratic-Kitaev chain
• Kitaev's exact solution approximated
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• Bi${}_2$Se${}_3$ thin films heteroepitaxially grown on $\alpha$-RuCl${}_3$
• Intermediate phases in $\alpha$-RuCl${}_3$ under in-plane magnetic field via interlayer spin interactions
• Complex orders and chirality in the classical Kitaev-$\Gamma$ model
• Coupled spin-1/2 antiferromagnetic chain Cs${}_2$LiRuCl${}_6$ with partially disordered crystal lattice
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• Thermal decomposition of the Kitaev material $\alpha$-RuCl${}_3$ and its influence on low-temperature behavior
• Majorana Gap Formation in the Anisotropic Kitaev Model with Ordered Flux Configuration
• Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions
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• Exotic magnetic anisotropy near digitized dimensional Mott boundary
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• Real-time control of non-Abelian anyons in Kitaev spin liquid under energy dissipation
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• Understanding the magnetic interactions of the zig-zag honeycomb lattice: Application to $\alpha$-RuCl${}_3$
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• Magnetic excitations in the Kitaev material Na${}_2$IrO${}_3$ studied by neutron scattering
• Stabilization of zigzag order in NiPS${}_3$ via positive biquadratic interaction
• Magnetic-field induced melting of long-range magnetic order akin to Kitaev insulators in the metallic compound Tb5Si3
• Phaseless auxiliary-field quantum Monte Carlo method with spin-orbit coupling
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• Nesting instability of gapless U(1) spin liquids with spinon Fermi pockets in two dimensions
• Formation of orbital molecules on a pyrochlore lattice induced by A-O bond covalency
• Magnetic field effects on the Kitaev model coupled to environment
• Low-temperature spin dynamics and absence of magnetic order in layered $\alpha$-RuI${}_3$
• Kitaev interaction and possible spin liquid state in CoI2 and Co2/3Mg1/3I2
• Ground state of the staggered Heisenberg-$\Gamma$ honeycomb model in a magnetic field
• Ligand-SOC enhanced $4f^5$ Kitaev antiferromagnet: Application to ${\mathrm{SmI}}_3$
• Evolution of crystal field and intraionic interactions in the ilmenite $A$IrO${}_3$ ($A$ = Mg, Zn, Cd) and hyperhoneycomb $\beta$-ZnIrO${}_3$