A new high-temperature quantum spin liquid with polaron spins

Abstract

The existence of a quantum spin liquid (QSL) in which quantum fluctuations of spins are sufficiently strong to preclude spin ordering down to zero temperature was originally proposed theoretically more than 40 years ago, but its experimental realisation turned out to be very elusive. Here we report on an almost ideal spin liquid state that appears to be realized by atomic-cluster spins on the triangular lattice of a charge-density wave (CDW) state of 1T-TaS${}_2$. In this system, the charge excitations have a well-defined gap of $\sim 0.3$ eV, while nuclear magnetic quadrupole resonance and muon spin relaxation experiments reveal that the spins show gapless quantum spin liquid dynamics and no long range magnetic order down to 70~mK. Canonical $T^2$ power-law temperature dependence of the spin relaxation dynamics characteristic of a QSL is observed from 200~K to $T_f=55$ K. Below this temperature we observe a new gapless state with reduced density of spin excitations and high degree of local disorder signifying new quantum spin order emerging from the QSL.

15 pages, 4 figures, submitted for a publication

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Cited by in corpus (107)

• Quantum Spin Liquids
• A Field Guide to Spin Liquids
• Is 1T-TaS${}_2$ a 40 year old quantum spin liquid?
• Experimental identification of quantum spin liquids
• Band insulator to Mott insulator transition in 1T-TaS${}_2$
• The Chemistry of Quantum Spin Liquids
• Imaging spinon density modulations in a 2D quantum spin liquid
• Mottness versus unit-cell doubling as the driver of the insulating state in 1T-TaS2
• Disrupted orbital order and the pseudo-gap in layered 1T-TaS${}_2$
• Ultrafast doublon dynamics in photo-excited 1T-TaS${}_2$
• Spinon Fermi surface in a cluster Mott insulator model on a triangular lattice and possible application to 1T-TaS${}_2$
• Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2
• Quantum spin liquid in the Ising triangular-lattice antiferromagnet neodymium heptatantalate
• Gapless excitations in the ground state of 1T-TaS${}_2$
• The low-temperature highly correlated quantum phase in the charge-density-wave 1T-TaS_2 compound
• Four-Spin Terms and the Origin of the Chiral Spin Liquid in Mott Insulators on the Triangular Lattice
• Coexisting localized and itinerant gapless excitations in a quantum spin liquid candidate 1T-TaS${}_2$
• Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2
• Ultrafast jamming of electrons into an amorphous entangled state
• Phonon-assisted magnetic Mott-insulating state in the charge density wave phase of single-layer 1TNbSe2
• Magnetic memory and spontaneous vortices in a van der Waals superconductor
• Nature of the randomness-induced quantum spin liquids in two dimensions
• Emergent Honeycomb Network of Topological Excitations in Correlated Charge Density Wave
• Chiral spin liquid with spinon Fermi surfaces in spin-$1/2$ triangular Heisenberg model
• Visualization of Chiral Electronic Structure and Anomalous Optical Response in a Material with Chiral Charge Density Waves
• Quasi one-dimensional metallic band dispersion in the commensurate charge density wave of $1T$-TaS${}_2$
• Heat transport study of the spin liquid candidate 1T-TaS2
• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe${}_2$
• Experimental signatures of quantum and topological states in frustrated magnetism
• Emergence of spin singlets with inhomogeneous gaps in the kagome Heisenberg antiferromagnets Zn-barlowite and herbertsmithite
• Chiral to Nematic Crossover in the Superconducting State of 4Hb-TaS${}_2$
• Effect of Stacking Order on the Electronic State of 1T-TaS${}_2$
• Vesignieite: a $S=\frac{1}{2}$ kagome antiferromagnet with dominant third-neighbor exchange
• Mott versus hybridization gap in the low-temperature phase of $1T$-TaS${}_2$
• Mott insulator tuning via structural distortion in monolayer 1T-NbSe2
• Mottness collapse without metallisation in the domain walls of triangular-lattice Mott insulator 1T-TaS${}_2$
• Out-of-plane transport of 1T-TaS2/graphene-based van der Waals heterostructures
• Development of short and long-range magnetic order in the double perovskite based frustrated triangular lattice antiferromagnet Ba2MnTeO6
• A time-domain phase diagram of metastable states in a charge ordered quantum material
• Real-time observation of the coherent transition to a metastable emergent state in 1T-TaS${}_2$
• Intrinsic Spin Susceptibility and Pseudogap-like Behavior in Infinite-Layer LaNiO2
• Zoology of domain walls in quasi-2D correlated charge density wave of 1T-TaS2
• Kondo screening in a charge-insulating spinon metal
• Inducing and tuning Kondo screening in a narrow-electronic-band system
• Realization of metallic state in 1T-TaS2 with persisting long-range order of charge density wave
• Kitaev Quantum Spin Liquids
• Impurity Moments Conceal Low-Energy Relaxation of Quantum Spin Liquids
• Signature of a randomness-driven spin-liquid state in a frustrated magnet
• Finite-temperature properties of the extended Heisenberg model on a triangular lattice
• Magnetic Impurity as a Local Probe of the U(1) Quantum Spin Liquid with Spinon Fermi Surface
• Thermodynamic properties of an $S=1/2$ ring-exchange model on the triangular lattice
• Spin liquid state in a rare-earth hyperkagome lattice
• Surface structure and stacking of the commensurate $\left(\sqrt{13}\times \sqrt{13}\right)$R13.9° charge density wave phase of 1T-TaS${}_2$(0001)
• Magnetic and spin-liquid phases in the frustrated $t-t^{\prime }$ Hubbard model on the triangular lattice
• Magnetic properties of triangular lattice antiferromagnets Ba3RB9O18 (R = Yb, Er)
• Probing quantum spin liquids with a quantum twisting microscope
• Fractionalization on the Surface: Is Type-II Terminated $1T$-TaS${}_2$ Surface an Anomalously Realized Spin Liquid?
• Stacking effect and Coulomb correlation in layered charge density wave phase of 1T-NbS2
• Unquantized thermal Hall effect in quantum spin liquids with spinon Fermi surfaces
• Vanishing Wilson ratio as the hallmark of quantum spin-liquid models
• Modified interlayer stacking and insulator to correlated-metal transition driven by uniaxial strain in 1$T$-TaS${}_2$
• Quantum billiards with correlated electrons confined in triangular transition metal dichalcogenide monolayer nanostructures created by laser quench
• Competition of Spinon Fermi Surface and Heavy Fermi Liquids states from the Periodic Anderson to the Hubbard model
• Impurity-induced resonant spinon zero modes in Dirac quantum spin-liquids
• Recent progress on magnetic-field studies on quantum-spin-liquid candidates
• Nematic Ising superconductivity with hidden magnetism in few-layer 6R-TaS2
• Charge disproportionation in the spin-liquid candidate $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$ at 6 K revealed by ${}^{63}$Cu NQR measurements
• Honeycomb-Lattice Mott insulator on Tantalum Disulphide
• Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc)
• Magnetic properties and spin dynamics in a spin-orbit driven Jeff= 1/2 triangular lattice antiferromagnet
• Emergence of the spin polarized domains in the kagome lattice Heisenberg antiferromagnet Zn-barlowite (Zn${}_{0.95}$Cu${}_{0.05}$)Cu${}_3$(OD)${}_6$FBr
• Understanding the flat band in 1T-TaS2 using a rotated basis
• Evidences for the random singlet phase in a new honeycomb iridate SrIr${}_2$O${}_{6-\delta }$
• Effects of frustration on the nonequilibrium dynamics of photo-excited lattice systems
• Spectroscopic evidence for possible quantum spin liquid behavior in a two-dimensional Mott insulator
• Similarity of thermodynamic properties of Heisenberg model on triangular and kagome lattices
• Distinguishing and controlling Mottness in 1T-TaS${}_2$ by ultrafast light
• Friction Anomalies at First-Order Transition Spinodals: 1T-TaS${}_2$
• Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin-liquids
• Possible glass-like random singlet magnetic state in 1T-TaS2
• Renormalization of the Mott gap by lattice entropy: The case of 1T-TaS2
• Is spontaneous vortex generation in superconducting 4Hb-TaS${}_2$ from vison-vortex nucleation with ${\mathbb{Z}}_2$ topological order?
• Understanding the magnetic response of the Quantum spin liquid compound 1T-TaS2
• Kondo enabled transmutation between spinons and superconducting vortices: origin of magnetic memory in 4Hb-$\mathrm{Ta}{\mathrm{S}}_2$
• Instability of the $U(1)$ spin liquid with a large spinon Fermi surface in the Heisenberg-ring exchange model on the triangular lattice
• Photoinduced Dynamics of Commensurate Charge Density Wave in 1T-TaS${}_2$ Based on Three-Orbital Hubbard Model
• Interlayer Hopping between Surface Mott Insulator and Bulk Band Insulator in layered 1T-TaS_{2}
• Magnetic inhomogeneity in the copper pseudochalcogenide CuNCN
• Behavior under magnetic field of resonance at the edge of the upper Hubbard band in 1T-TaS2
• Probing enhanced superconductivity in van der Waals polytypes of V${}_x$TaS${}_2$
• Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2
• Probing complex stacking in a layered material via electron-nuclear quadrupolar coupling
• Quantum Phases and Spin Liquid Properties of 1T-TaS2
• Theoretical Modeling of the Non-equilibrium Amorphous State in 1T-TaS${}_2$
• Imaging of electrically controlled van der Waals layer stacking in 1T-TaS2
• Van der Waals devices for surface-sensitive experiments
• Exact diagonalization study of triangular Heisenberg model with four-spin ring-exchange interaction
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
• Effect of Interlayer Stacking on the Electronic Properties of 1$T$-TaS${}_2$
• Designer quantum matter in van der Waals heterostructures
• Emergent quantum phenomena in two-dimensional 1T-TaS2
• Strongly Enhanced Charge-Density Waves and Correlated Insulating State in Atomically Thin 1$T$-TaS${}_2$
• Dynamical control of Coulomb interactions and Hubbard bands in monolayer 1T-TaS${}_2$
• Role of hydrogen bonding in charge-ordered organic conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$ probed by ${}^{127}$I nuclear quadrupole resonance
• Triplet resonating valence bond theory and transition metal chalcogenides
• Collapse of susceptibility and non-trivial spin dynamics in the hyper-honeycomb magnet $\beta$-Li${}_2$IrO${}_3$ under high pressure