Bound states and field-polarized Haldane modes in a quantum spin ladder

The 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 fiel...

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Bibliographic Details
Published in:arXiv.org 2016-09
Main Authors: Ward, S, Bouillot, P, Kollath, C, Giamarchi, T, Schmidt, K P, Normand, B, Krämer, K W, Biner, D, Bewley, R, Guidi, T, Boehm, M, McMorrow, D F, Rüegg, Ch
Format: Article
Language:English
Subjects:
Elementary excitations
Excitation
Magnons
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Summary:The 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1609.00198