Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Abstract

Transport properties provide important access to a solid's quasiparticles, such as quasiparticle density, mobility, and scattering. The transport of heat can be particularly revealing because, in principle, all types of excitations in a solid may contribute. Heat transport is well understood for phonons and electrons, but relatively little is known about heat transported by magnetic excitations. However, during the last about two decades, the magnetic heat transport attracted increasing attention after the discovery of large and unusual signatures of it in low-dimensional quantum magnetic cuprate materials. Today it constitutes an important probe to otherwise often elusive, topological quasiparticles in a broader class of quantum magnets. This review summarizes the experimental foundation of this research, i.e. the state of the art for the magnetic heat transport in the mentioned cuprate materials which host prototypical low-dimensional antiferromagnetic $S=1/2$ Heisenberg models. These comprise, in particular, the two-dimensional square lattice, and one-dimensional spin chain and two-leg ladder spin models. It is shown, how studying the heat transport provides direct access to the thermal occupation and the scattering of the already quite exotic quasiparticles of these models which range from spin-1 spin wave and triplon excitations to fractionalized spin-1/2 spinons. Remarkable transport properties of these quasiparticles have been revealed: the spin-heat transport often is highly efficient and in some cases even ballistic, in agreement with theoretical predictions.

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Cited by in corpus (24)

• Finite-temperature transport in one-dimensional quantum lattice models
• Diffusive hydrodynamics from integrability breaking
• Superdiffusion from emergent classical solitons in quantum spin chains
• Anomalous hydrodynamics in a class of scarred frustration-free Hamiltonians
• The silver route to cuprate analogs
• Weak integrability breaking: chaos with integrability signature in coherent diffusion
• Simulating hydrodynamics on noisy intermediate-scale quantum devices with random circuits
• Anomalous low-frequency conductivity in easy-plane XXZ spin chains
• Generalized hydrodynamics: a perspective
• Heat transport of the kagomé Heisenberg quantum spin liquid candidate YCu${}_3$(OH)${}_{6.5}$Br${}_{2.5}$: localized magnetic excitations and spin gap
• High-field thermal transport properties of the Kitaev quantum magnet alpha-RuCl3: evidence for low-energy excitations beyond the critical field
• Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux
• Thermal transport of the frustrated spin-chain mineral linarite: Magnetic heat transport and strong spin-phonon scattering
• Low temperature magnetism of KAgF3
• Evidence of one-dimensional magnetic heat transport in the triangular-lattice antiferromagnet Cs${}_2$CuCl${}_4$
• Ballistic magnetic thermal transport coupled to phonons
• Thermal and optical conductivity in the Holstein model at half filling and at finite temperature in the Luttinger-liquid and charge-density-wave regime
• Transport and integrability-breaking in non-Hermitian many-body quantum systems
• Finite-momentum energy dynamics in a Kitaev magnet
• Finite-temperature transport in the gapped spin-1/2 XXZ chain and one-dimensional lattice spinless fermion model
• 1/5 and 1/3 magnetization plateaux in the spin 1/2 chain system YbAlO3
• Hierarchy of timescales in a disordered spin-$1/2$ XX ladder
• Harnessing spin-qubit decoherence to probe strongly-interacting quantum systems
• Scattering of spinon excitations by potentials in the 1D Heisenberg model