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

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.

6 pages, 3 figures plus supplementary material 7 pages 5 figures

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• Observation of 4- and 6-magnon bound-states in the spin-anisotropic frustrated antiferromagnet FeI${}_2$
• Finite-temperature correlations in a quantum spin chain near saturation
• Dynamic structure factor of disordered quantum spin ladders
• Magnetic field - temperature phase diagram of ferrimagnetic alternating chains: spin-wave theory from a fully polarized vacuum
• Beyond perturbation theory: A time-dependent approach to inelastic scattering spectroscopies in- and away from equilibrium
• Triplons, Magnons, and Spinons in a Single Quantum Spin System: SeCuO3
• Fingerprints of supersymmetric spin and charge dynamics observed by inelastic neutron scattering
• Low dimensional correlations under thermal fluctuations
• Mixed-spin Heisenberg ladders in a magnetic field
• Confinement and oscillating deconfinement crossover of two-magnon excitations in quantum spin chains quantified by spin entanglement entropy
• Fractional spin excitations and conductance in the spiral staircase Heisenberg ladder
• Magnetic and phononic dynamics in the two-ladder quantum magnet (C5H9NH3)2CuBr4
• One-dimensional physics of the frustrated quantum magnet PHCC