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Bound States and Field-Polarized Haldane Modes in a Quantum Spin Ladder

Mena, M.
Schmidt, K. P.
Normand, B.
Krämer, K. W.
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Published in Physical Review Letters. 2017, vol. 118, no. 17, p. 177202
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 modeling of the dynamical response demonstrates our complete quantitative understanding of these states.
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Research groups Groupe Ruegg
Groupe Giamarchi
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WARD, Simon et al. Bound States and Field-Polarized Haldane Modes in a Quantum Spin Ladder. In: Physical Review Letters, 2017, vol. 118, n° 17, p. 177202. https://archive-ouverte.unige.ch/unige:101046

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Deposited on : 2018-01-02

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