Large field-induced gap of Kitaev-Heisenberg paramagnons in $\alpha$-RuCl${}_3$

Abstract

The honeycomb Kitaev-Heisenberg model is a source of a quantum spin liquid with Majorana fermions and gauge flux excitations as fractional quasiparticles. In the quest of finding a pertinent material, $\alpha$-RuCl${}_3$ recently emerged as a prime candidate. Here we unveil highly unusual low-temperature heat conductivity $\kappa$ of $\alpha$-RuCl${}_3$: beyond a magnetic field of $B_c\approx$ 7.5 T, $\kappa$ increases by about one order of magnitude, resulting in a large magnetic field dependent peak at about 7 K, both for in-plane as well as out-of-plane transport. This clarifies the unusual magnetic field dependence unambiguously to be the result of severe scattering of phonons off putative Kitaev-Heisenberg excitations in combination with a drastic field-induced change of the magnetic excitation spectrum. In particular, an unexpectedly large energy gap arises, which increases approximately linearly with the magnetic field and reaches a remarkably large $\hslash {\omega }_0/k_B\approx$ 50 K at 18 T.

9 pages, 4 figures, supplementary information included

References in corpus (9)

• $\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice
• Magnetic order in $\alpha$-RuCl${}_3$: a honeycomb lattice quantum magnet with strong spin-orbit coupling
• Exact results for spin dynamics and fractionization in the Kitaev Model
• Evidence for a Field-induced Quantum Spin Liquid in $\alpha$-RuCl${}_3$
• Successive magnetic phase transitions in $\mathbf{\alpha }$-RuCl${}_3$: XY-like frustrated magnet on the honeycomb lattice
• Breakdown of Magnons in a Strongly Spin-Orbital Coupled Magnet
• Anisotropic Ru3+ 4d5 magnetism in the alpha-RuCl3 honeycomb system: susceptibility, specific heat and Zero field NMR
• Anomalous thermal conductivity and magnetic torque response in the honeycomb magnet $\alpha$-RuCl${}_3$
• Dynamics and transport of the Z_2 spin liquid: application to kappa-(ET)2Cu2(CN)3

Cited by in corpus (145)

• Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid
• A Field Guide to Spin Liquids
• Hunting Majorana Fermions in Kitaev Magnets
• Unusual thermal Hall effect in a Kitaev spin liquid candidate $\alpha$-RuCl${}_3$
• Robustness of the thermal Hall effect close to half-quantization in a field-induced spin liquid state
• Field-induced quantum spin disordered state in spin-1/2 honeycomb magnet Na2Co2TeO6
• The planar thermal Hall conductivity in the Kitaev magnet α-RuCl3
• Observation of two types of anyons in the Kitaev honeycomb magnet
• Sample dependence of the half-integer quantized thermal Hall effect in the Kitaev candidate $\alpha$-RuCl${}_3$
• Weak-field induced nonmagnetic state in a Co-based honeycomb
• Finite field regime for a quantum spin liquid in $\alpha$-RuCl${}_3$
• Dynamical and Topological Properties of the Kitaev Model in a [111] Magnetic Field
• Heisenberg-Kitaev physics in magnetic fields
• Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet alpha-RuCl3
• Evidence of a Phonon Hall Effect in the Kitaev Spin Liquid Candidate $\alpha$-RuCl${}_3$
• Large Thermal Hall Effect in $\alpha$-RuCl${}_3$: Evidence for Heat Transport by Kitaev-Heisenberg Paramagnons
• Electronic properties of α-RuCl3 in proximity to graphene
• Spin Wave Analysis of Low-Temperature Thermal Hall Effect in the Candidate Kitaev Spin Liquid $\alpha$-RuCl${}_3$
• Field-induced intermediate ordered phase and anisotropic interlayer interactions in $\alpha$-RuCl${}_3$
• Successive Majorana Topological Transitions Driven by a Magnetic Field in the Kitaev Model
• High-Field Quantum Disordered State in $\alpha$-RuCl3: Spin Flips, Bound States, and a Multi-Particle Continuum
• A classification of 3+1D bosonic topological orders (II): the case when some point-like excitations are fermions
• Field evolution of magnons in $\alpha$-RuCl${}_3$ by high-resolution polarized terahertz spectroscopy
• Magnetic ground state of the Kitaev Na${}_2$Co${}_2$TeO${}_6$ spin liquid candidate
• Unusual heat transport of the Kitaev material Na${}_2$Co${}_2$TeO${}_6$: putative quantum spin liquid and low-energy spin excitations
• Pressure-induced melting of magnetic order and emergence of new quantum state in alpha-RuCl3
• Thermal Hall effects in quantum magnets
• Impact of off-diagonal exchange interactions on the Kitaev spin liquid state of $\alpha$-RuCl${}_3$
• Large Phonon Thermal Hall Conductivity in a Simple Antiferromagnetic Insulator
• Signatures of low-energy fractionalized excitations in $\alpha$-RuCl${}_3$ from field-dependent microwave absorption
• Thermodynamic and Transport Properties in Disordered Kitaev Models
• Classical and quantum spin dynamics of the honeycomb $\Gamma$ model
• Electrical probes of the non-Abelian spin liquid in Kitaev materials
• Electrical Access to Ising Anyons in Kitaev Spin Liquids
• Van Hove singularity in the magnon spectrum of the antiferromagnetic quantum honeycomb lattice
• Detuning the Honeycomb of $\alpha$-RuCl${}_3$: Pressure-Dependent Optical Studies Reveal Broken Symmetry
• Field-induced quantum spin liquid in the Kitaev-Heisenberg model and its relation to $\alpha$-RuCl${}_3$
• Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite
• Theory of the Kitaev model in a [111] magnetic field
• The Heart of Entanglement: Chiral, Nematic, and Incommensurate Phases in the Kitaev-Gamma Ladder in a Field
• Raman evidence for dimerization and Mott collapse in $\alpha$-RuCl${}_3$ under pressures
• Signatures of magnetic-field-driven quantum phase transitions in the entanglement entropy and spin dynamics of the Kitaev honeycomb model
• Crystal field splitting, local anisotropy, and low energy excitations in the quantum magnet YbCl${}_3$
• Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling
• Emergence of a nematic paramagnet via quantum order-by-disorder and pseudo-Goldstone modes in Kitaev magnets
• Magnetoelastic coupling and effects of uniaxial strain in $\alpha$-RuCl${}_3$ from first principles
• Ground state and low-energy excitations of the Kitaev-Heisenberg ladder
• Giant Phonon Anomalies in the Proximate Kitaev Quantum Spin Liquid $\alpha$-RuCl${}_3$
• Phonon renormalization in the Kitaev quantum spin liquid
• Field-induced phase transitions of the Kitaev material $\alpha$-RuCl${}_3$ probed by thermal expansion and magnetostriction
• Kitaev honeycomb models in magnetic fields: Dynamical response and hidden symmetries
• Electronic and magnetic properties of the RuX${}_3$ (X=Cl, Br, I) family: Two siblings -- and a cousin?
• Towards Kitaev Spin Liquid in 3d Transition Metal Compounds
• Giant thermal magnetoconductivity in CrCl${}_3$ and a general model for spin-phonon scattering
• Heat Transport in Herbertsmithite: Can a Quantum Spin Liquid Survive Disorder?
• Two-step gap opening across the quantum critical point in a Kitaev honeycomb magnet
• Vison Crystals in an Extended Kitaev Model on the Honeycomb Lattice
• Pressure-induced collapse of spin-orbital Mott state in the hyperhoneycomb iridate $\beta$-Li${}_2$IrO${}_3$
• Ordered states in the Kitaev-Heisenberg model: From 1D chains to 2D honeycomb
• Magnetic field-induced evolution of intertwined orders in the Kitaev magnet $\beta$-Li${}_2$IrO${}_3$
• Significant thermal Hall effect in the 3$d$ cobalt Kitaev system $N{a}_{2}C{o}_{2}Te{O}_6$
• Oscillations in the magnetothermal conductivity of $\mathbf{\alpha }$-RuCl${}_3$: Evidence of transition anomalies
• Majorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet $\alpha$-RuCl${}_3$
• Magnon dispersion and dynamic spin response in three-dimensional spin models for $\alpha$-RuCl${}_3$
• Comprehensive study of the phase diagram of the spin-1/2 Kitaev-Heisenberg-Gamma chain
• Novel chiral quantum spin liquids in Kitaev magnets
• Observation of a random singlet state in a diluted Kitaev honeycomb material
• Spin-glass state and reversed magnetic anisotropy induced by Cr doping in the Kitaev magnet $\alpha$-RuCl${}_3$
• Symmetry-based requirement for the measurement of electrical and thermal Hall conductivity under an in-plane magnetic field
• Thermal Transport for Probing Quantum Materials
• Kitaev Quantum Spin Liquids
• Stacking disorder and thermal transport properties of $\alpha$-RuCl${}_3$
• High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb $\alpha$-Li${}_2$IrO${}_3$
• High-field thermal transport properties of the Kitaev quantum magnet alpha-RuCl3: evidence for low-energy excitations beyond the critical field
• Quantum and classical behavior of spin-$S$ Kitaev models in an anisotropic limit
• The sample-dependent and sample-independent thermal transport properties of $\alpha$-RuCl${}_3$
• Quantum spin state transitions in spin-1 equilateral triangular lattice antiferromagnet Na${}_2$BaNi(PO${}_4$)${}_2$
• Planar thermal Hall effect from phonons in a Kitaev candidate material
• Investigation of the magnetoelastic coupling anisotropy in the Kitaev material $\alpha$-RuCl${}_3$
• Field-angle dependence of thermal Hall conductivity in magnetically ordered Kitaev-Heisenberg system
• Pressure-induced structural dimerization in the hyperhoneycomb iridate $\beta$-Li${}_2$IrO${}_3$ at low temperatures
• Heat transport in the anisotropic Kitaev spin liquid
• Temperature evolution of the phonon dynamics in the Kitaev spin liquid
• Phonon thermal transport shaped by strong spin-phonon scattering in a Kitaev material Na${}_2$Co${}_2$TeO${}_6$
• Spin-phonon scattering-induced low thermal conductivity in a van der Waals layered ferromagnet Cr${}_2$Si${}_2$Te${}_6$
• Thermal Hall Effect in the Kitaev-Heisenberg System with Spin-Phonon Coupling
• Self-selecting vapor growth of transition metal halide single crystals
• Thermal anyon interferometry in phonon-coupled Kitaev spin liquids
• Topological phase transition to Abelian anyon phases due to off-diagonal exchange interaction in the Kitaev spin liquid state
• Anyon dynamics in field-driven phases of the anisotropic Kitaev model
• Thermally induced metallic phase in a gapped quantum spin liquid - a Monte Carlo study of the Kitaev model with parity projection
• Topological thermal Hall effect for topological excitations in spin liquid: Emergent Lorentz force on the spinons
• Recent progress on magnetic-field studies on quantum-spin-liquid candidates
• Polaronic Conductivity in Cr${}_2$Ge${}_2$Te${}_6$ Single Crystals
• Short-range Crystalline Order-Tuned Conductivity in Cr${}_2$Si${}_2$Te${}_6$ van der Waals Magnetic Crystals
• Detuning the Honeycomb of the α-RuCl3 Kitaev lattice: A case of Cr3+ dopant
• Emergent orbital magnetization in Kitaev quantum magnets
• Flux mobility delocalization in the Kitaev spin ladder
• Phononic-magnetic dichotomy of the thermal Hall effect in the Kitaev-Heisenberg candidate material Na${}_2$Co${}_2$TeO${}_6$
• Field evolution of low-energy excitations in the hyperhoneycomb magnet $\beta$-Li${}_2$IrO${}_3$
• Comparing the influence of Floquet dynamics in various Kitaev-Heisenberg materials
• Diagonal and off-diagonal thermal conduction with resonant phonon scattering in $N{i}_{3}Te{O}_6$
• Oscillations of the thermal conductivity observed in the spin-liquid state of $\alpha$-RuCl${}_3$
• Spin wave theory of one-dimensional generalized Kitaev model
• Phonons and phase symmetries in bulk $CrC{l}_3$ from scattering measurements and theory
• Phonon thermal Hall effect in Mott insulators via skew-scattering by the scalar spin chirality
• Acoustic phonon dispersion of $\alpha$-RuCl${}_3$
• Low temperature enhancement of ferromagnetic Kitaev correlations in α-RuCl3
• Phases and Quantum Phase Transitions in an Anisotropic Ferromagnetic Kitaev-Heisenberg-$\Gamma$ Magnet
• Dissipationless Spin Current Generation in Kitaev's Chiral Spin Liquid
• Neutron spectroscopy evidence for a possible magnetic-field-induced gapless quantum-spin-liquid phase in a Kitaev material $\alpha$-RuCl${}_3$
• Charge-Neutral Electronic Excitations in Quantum Insulators
• Symmetry Analysis of Tensors in the Honeycomb Lattice of Edge-Sharing Octahedra
• Phonon Dynamics in the Generalized Kitaev Spin Liquid
• Realization and detection of Kitaev quantum spin liquid with Rydberg atoms
• Magnetothermal transport in ultraclean single crystals of Kitaev magnet $\alpha$-RuCl${}_3$
• Orbital Magnetic Field Effects in Mott Insulators with Strong Spin-Orbit Coupling
• Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field
• Confinement transition in a Kitaev-like honeycomb model with bond anisotropy
• Spin liquid fingerprints in the thermal transport of a Kitaev-Heisenberg ladder
• Electronic structure of $\mathbf{\alpha }$-RuCl${}_3$ by fixed-node and fixed-phase diffusion Monte Carlo methods
• Suppression of the antiferromagnetic order by Zn doping in a possible Kitaev material Na${}_2$Co${}_2$TeO${}_6$
• Specific heat of 2D interacting Majorana fermions from holography
• Abnormally enhanced Hall Lorenz number in the magnetic Weyl semimetal NdAlSi
• Dynamic structure factor of the antiferromagnetic Kitaev model in large magnetic fields
• From linear to circular polarized light -- Floquet engineering in Kitaev-Heisenberg materials with Lissajous figures
• Efficient Method for Prediction of Meta-stable/Ground Multipolar Ordered States and its Application in Monolayer $\alpha$-\ce{RuX3} (X=Cl,I)
• Signatures of a gapless quantum spin liquid in the Kitaev material Na${}_3$Co${}_{2-x}$Zn${}_x$SbO${}_6$
• Sound attenuation in the hyperhoneycomb Kitaev spin liquid
• Ultrafast spin dynamics in the proximate quantum spin liquid α-RuCl3
• Interplay of frustration and quantum fluctuations in a spin-1/2 anisotropic square lattice
• Interplay of itinerant electrons and Ising moments in a hybrid honeycomb quantum magnet TmNi${}_3$Al${}_9$
• Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets
• Finite-momentum energy dynamics in a Kitaev magnet
• Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime
• Magnetostriction in the $J$-$K$-$\Gamma$ model: Application of the numerical linked cluster expansion
• Robustness of Vacancy-Bound Non-Abelian Anyons in the Kitaev Model in a Magnetic Field
• Spin-phonon coupling and thermal Hall effect in the Kitaev model
• Scaling behavior and giant field-enhancement of the thermal conductivity in the honeycomb antiferromagnet BaCo2(AsO4)2
• Scale-invariant magnetic anisotropy in $\alpha$-RuCl${}_3$: A quantum Monte Carlo study
• Nesting instability of gapless U(1) spin liquids with spinon Fermi pockets in two dimensions
• Signatures of a Majorana-Fermi surface in the Kitaev magnet Ag${}_3$LiIr${}_2$O${}_6$
• Direct probe of magnetic field effects on phonons by ultrasound propagation in a quasi-two-dimensional honeycomb magnet Na${}_2$Co${}_2$TeO${}_6$
• Complex Temperature-dependent Thermal Conductivity in a Sawtooth Chain Magnet Fe${}_2$SiSe${}_4$
• Spin disorder state induced by Mg${}^{2+}$ doping in a Kitaev material Na${}_3$Co${}_2$SbO${}_6$