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

Ward, S; Bouillot, P; Kollath, C; Giamarchi, T; Schmidt, KP; Normand, B; Krämer, KW; ... Rüegg, C; + view all (2017) Bound states and field-polarized Haldane modes in a quantum spin ladder. Physical Review Letters , 118 , Article 177202. 10.1103/PhysRevLett.118.177202. Green open access

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Abstract

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.

Type: Article
Title: Bound states and field-polarized Haldane modes in a quantum spin ladder
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.118.177202
Publisher version: http://doi.org/10.1103/PhysRevLett.118.177202
Language: English
Additional information: © 2017 American Physical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1529018
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