2018/01/31 by Florian Lange, F. F. Lange, Satoshi Ejima +1
Physics and Astronomy · #Anisotropy #Antiferromagnetism #Condensed matter physics #Excited state #Ferromagnetism #Magnon #Momentum transfer #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum many-body systems #Quantum mechanics #Scattering #Singlet state #Spin (aerodynamics) #Transfer matrix #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.97.060403
published as Phys. Rev. B 97, 060403 (2018) · revised version with minor changes and fixes, accepted for publication in Physical Review B (Rapid Communications)
arxiv created 2018/02/04 · openalex publication_date 2018/02/12 · arxiv updated 2018/02/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Improving matrix-product state techniques based on the purification of the density matrix, we are able to accurately calculate the finite-temperature dynamic response of the infinite spin-1 XXZ chain with single-ion anisotropy in the Haldane, large-D, and antiferromagnetic phases. Distinct thermally activated scattering processes make a significant contribution to the spectral weight in all cases. In the Haldane phase, intraband magnon scattering is prominent, and the on-site anisotropy causes the magnon to split into singlet and doublet branches. In the large-D phase response, the intraband signal is separated from an exciton-antiexciton continuum. In the antiferromagnetic phase, holons are the lowest-lying excitations, with a gap that closes at the transition to the Haldane state. At finite temperatures, scattering between domain-wall excitations becomes especially important and strongly enhances the spectral weight for momentum transfer \ensuremathπ.