Ultrafast spin dynamics in the proximate quantum spin liquid α-RuCl3

Abstract

α-RuCl3 is a Kitaev material suggested to be a proximate quantum spin liquid in a certain temperature and magnetic field range. Nonequilibrium measurements of transient dynamics have been proposed to detect fractionalized particles that emerge in the spin liquid and to possibly drive the system into novel photoinduced magnetic states that cannot be accessed by conventional equilibrium probes. Here we study ultrafast spin dynamics of photoinduced excitations in α-RuCl3 using pump-probe transient grating spectroscopy. In the real part of the complex transient reflectance change ΔR/R, we observe the long-range antiferromagnetic correlation near the Néel temperature. Most intriguingly, above the Néel temperature in the Kitaev paramagnetic phase, we reveal a photoexcitation component sensitive to the in-plane magnetic field in the imaginary part of ΔR/R. This component exhibits two distinct lifetimes of about tens of picoseconds. This photoexcitation component may be connected to novel photoexcited states in the Kitaev quantum spin liquid, and its lifetimes likely reflect the dynamics of unconventional spin excitations in the Kitaev model.

References in corpus (51)

• Anyons in an exactly solved model and beyond
• Quantum Spin Liquid States
• Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid
• Proximate Kitaev Quantum Spin Liquid Behaviour in α-RuCl${}_3$
• Kitaev quantum spin liquid - concept and materialization
• $\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice
• Relevance of the Heisenberg-Kitaev model for the honeycomb lattice iridates A_2IrO_3
• Neutron tomography of magnetic Majorana fermions in a proximate quantum spin liquid
• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Hyper-honeycomb iridate $\beta$-Li2IrO3 as a platform for Kitaev magnetism
• Half-integer quantized anomalous thermal Hall effect in the Kitaev material $\alpha$-RuCl${}_3$
• Fermionic response from fractionalization in an insulating two-dimensional magnet
• A new spin-anisotropic harmonic honeycomb iridate
• Breakdown of Magnons in a Strongly Spin-Orbital Coupled Magnet
• Phase Diagram of $\alpha$-RuCl${}_3$ in an in-plane Magnetic Field
• Observation of spin Coulomb drag in a two-dimensional electron gas
• Large field-induced gap of Kitaev-Heisenberg paramagnons in $\alpha$-RuCl${}_3$
• Magnetic Excitations and Continuum of a Field-Induced Quantum Spin Liquid in $\alpha$-RuCl${}_3$
• Fluctuating charge density waves in a cuprate superconductor
• Diffusion of Nonequilibrium Quasiparticles in a Cuprate Superconductor
• Controlled vaporization of the superconducting condensate in cuprate superconductors sheds light on the pairing boson
• Finite field regime for a quantum spin liquid in $\alpha$-RuCl${}_3$
• Ultrafast spin dynamics and critical behavior in half-metallic ferromagnet : Sr_2FeMoO_6
• Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates
• Ultrafast Dynamics Evidence of High Temperature Superconductivity in Single Unit Cell FeSe on SrTiO3
• Resolving continua of fractional excitations by spinon echo in THz 2D coherent spectroscopy
• Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system
• Thermodynamic evidence of fractionalized excitations in α-RuCl3
• Field-induced intermediate ordered phase and anisotropic interlayer interactions in $\alpha$-RuCl${}_3$
• Optically Driven Magnetic Phase Transition of Monolayer RuCl3
• Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor
• Theory of two-dimensional nonlinear spectroscopy for the Kitaev spin liquid
• Single crystal growth from separated educts and its application to lithium transition-metal oxides
• The range of non-Kitaev terms and fractional particles in RuCl${}_3$
• Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na${}_2$IrO${}_3$
• Doppler velocimetry of spin propagation in a two-dimensional electron gas
• Floquet engineering of Kitaev quantum magnets
• Coherent Propagation of Spin Helices in a Quantum-Well Confined Electron Gas
• Nonequilibrium Majorana Dynamics by Quenching a Magnetic Field in Kitaev Spin Liquids
• Measurement of electron-hole friction in an n-doped GaAs/AlGaAs quantum well using optical transient grating spectroscopy
• Temperature evolution of the phonon dynamics in the Kitaev spin liquid
• Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La${}_{2-x}$Ce${}_x$CuO${}_{4\pm \delta }$
• Determination of the spin-flip time in ferromagnetic SrRuO3 from time-resolved Kerr measurements
• Photoexcited states of the harmonic honeycomb iridate γ-Li${}_2$IrO${}_3$
• Photoinduced Floquet topological magnons in Kitaev magnets
• Tracking local magnetic dynamics via high-energy charge excitations in a relativistic Mott insulator
• Ultrafast Spin Dynamics and Photoinduced Insulator-to-Metal Transition in $\alpha$-$RuC{l}_3$
• Thermal transport in nanoporous holey silicon membranes investigated with optically-induced transient thermal gratings
• Light-induced magnetization driven by interorbital charge motion in a spin-orbit assisted Mott insulator alpha-RuCl3
• Quenching the Kitaev honeycomb model
• Nonequilibrium dynamics of $\alpha$-RuCl${}_3$ -- a time-resolved magneto-optical spectroscopy study

Cited by in corpus (2)

• Quantum decoherence by magnetic fluctuations in a magnetic topological insulator
• Mott Gap Softening Coinciding with Spin Correlations Collapse in a-RuCl3