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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Ward S., Mena M., Bouillot P., Kollath C., Giamarchi T., Schmidt K.P., Normand B., Krämer K., Biner D., Guidi T., Boehm M., McMorrow D.F., Rüegg C.,
Project Dimensional and Anisotropy Control of Model Quantum Magnets
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Original article (peer-reviewed)

Journal Phys. Rev. Lett.
Volume (Issue) 118
Page(s) 177202 - 6
Title of proceedings Phys. Rev. Lett.
DOI 10.1103/physrevlett.118.177202

Open Access

Type of Open Access Repository (Green Open Access)


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 modeling of the dynamical response demonstrates our complete quantitative understanding of these states.