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07 February 2025
 
  » arxiv » 1609.0198

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Bound states and field-polarized Haldane modes in a quantum spin ladder
S. Ward ; P. Bouillot ; C. Kollath ; T. Giamarchi ; K. P. Schmidt ; B. Normand ; K. W. Krämer ; D. Biner ; R. Bewley ; T. Guidi ; M. Boehm ; D. F. McMorrow ; Ch. Rüegg ;
Date 1 Sep 2016
AbstractThe challenge of one-dimensional systems is to understand their physics beyond the level of known elementary excitations. By high-resolution neutron spectroscopy in a quantum spin ladder material, we probe the leading multiparticle excitation by characterizing the two-magnon bound state at zero field. By applying high magnetic fields, we create and select the singlet (longitudinal) and triplet (transverse) excitations of the fully spin-polarized ladder, which have not been observed previously and are close analogs of the modes anticipated in a polarized Haldane chain. Theoretical modelling of the dynamical response demonstrates our complete quantitative understanding of these states.
Source arXiv, 1609.0198
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