2017/03/31 by Jonas Becker, Jonas N. Becker, Thomas Köhler +6 · 1 citation
Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Dynamic structure factor #Ferromagnetism #Ground state #Inelastic neutron scattering #Magnon #Monte Carlo method #Neutron scattering #Physics #Physics of Superconductivity and Magnetism #Population #Quantum Monte Carlo #Quantum and electron transport phenomena #Quantum many-body systems #Quantum mechanics #Scattering #Spin (aerodynamics) #Spin wave #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.060403
published as Phys. Rev. B 96, 060403 (2017) · 10 pages with 11 figures total (including Supplemental Material); changes in v2: new Figs. S1 and S5, Fig. S3 expanded + related discussion + many smaller modifications to match published version
openalex publication_date 2017/08/03 · arxiv created 2017/08/04 · arxiv updated 2017/08/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The antiferromagnetic spin-one chain is considerably one of the most fundamental quantum many-body systems, with symmetry-protected topological order in the ground state. Here, we present results for its dynamical spin structure factor at finite temperatures, based on a combination of exact numerical diagonalization, matrix-product-state calculations, and quantum Monte Carlo simulations. Open finite chains exhibit a subgap band in the thermal spectral functions, indicative of localized edge states. Moreover, we observe the thermal activation of a distinct low-energy continuum contribution to the spin spectral function with an enhanced spectral weight at low momenta and its upper threshold. This emerging thermal spectral feature of the Haldane spin-one chain is shown to result from intraband magnon scattering due to the thermal population of the single-magnon branch, which features a large bandwidth-to-gap ratio. These findings are discussed with respect to possible future studies on spin-one chain compounds based on inelastic neutron scattering.