Multispinon continua at zero and finite temperature in a near-ideal Heisenberg chain

Abstract

The space- and time-dependent response of many-body quantum systems is the most informative aspect of their emergent behaviour. The dynamical structure factor, experimentally measurable using neutron scattering, can map this response in wavevector and energy with great detail, allowing theories to be quantitatively tested to high accuracy. Here, we present a comparison between neutron scattering measurements on the one-dimensional spin-1/2 Heisenberg antiferromagnet KCuF3, and recent state-of-the-art theoretical methods based on integrability and density matrix renormalization group simulations. The unprecedented quantitative agreement shows that precise descriptions of strongly correlated states at all distance, time and temperature scales are now possible, and highlights the need to apply these novel techniques to other problems in low-dimensional magnetism.

References in corpus (10)

• Real time evolution using the density matrix renormalization group
• Lieb-Robinson bounds and the generation of correlations and topological quantum order
• Dephasing and the steady state in quantum many-particle systems
• Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain
• Universal theory of nonlinear Luttinger liquids
• Spectral functions in one-dimensional quantum systems at T>0
• Spectral Function for the S=1 Heisenberg Antiferromagetic Chain
• Exact edge singularities and dynamical correlations in spin-1/2 chains
• Phenomenology of One-Dimensional Quantum Liquids Beyond the Low-Energy Limit
• Spectral function of spinless fermions on a one-dimensional lattice

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